Benjamin Aw
Add updated pkl file v3
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{
"paper_id": "E91-1047",
"header": {
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"date_generated": "2023-01-19T10:37:51.036431Z"
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"title": "ASPECT CHOICE IN GERMAN-RUSSIAN MT",
"authors": [
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"abstract": "In this paper we discuss some problems arising in German-Russian Machine Translation with regard to tense and aspect. Since the formal category of aspect is missing in German the information required for generating Russian aspect forms has to be extracted from different representation levels. A sentence based procedure for aspect choice in the MT system VIRTEX is presented which takes lexieal, morphological and semantic criteria into account. The limits of this approach are shown. To overcome these difficulties a human interaction component is proposed.",
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{
"text": "In this paper we discuss some problems arising in German-Russian Machine Translation with regard to tense and aspect. Since the formal category of aspect is missing in German the information required for generating Russian aspect forms has to be extracted from different representation levels. A sentence based procedure for aspect choice in the MT system VIRTEX is presented which takes lexieal, morphological and semantic criteria into account. The limits of this approach are shown. To overcome these difficulties a human interaction component is proposed.",
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"section": "Abstract",
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"text": "Aspect is considered to bca grammatico-semanticai category for expressing various temporal references in relation to the speech act moment. Regardless of the great number of special meanings that can be expressed by the perfective or imperfectiv\u00a2 aspect (p.asp./i.asp.), there are two oppositions representing the systematic or basic aspectual meanings, namely +TOTALITY/+LIM/TEDNESS VerSus -TOTAL1TY/-LIMITEDNESS (see Bondarko 1990) .",
"cite_spans": [
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"start": 419,
"end": 433,
"text": "Bondarko 1990)",
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"section": "INTRODUCTION",
"sec_num": null
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"text": "In this paper we will discuss the transfer of tense and aspect, a problem which arises immediately in Machine Translation and differS from language pair to language pair. This mainly depends on how aspect is expressed in the particular languages concerned.",
"cite_spans": [],
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"section": "INTRODUCTION",
"sec_num": null
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"text": "It is obvious that aspect in several languages has a rather heterogeneous formal reflection in the verb system. Aspect and tense are closely connected with each other.",
"cite_spans": [],
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"section": "INTRODUCTION",
"sec_num": null
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"text": "In English, e.g., the two aspect constructions perfective and progressive can be seen as realizing the basic contrast of the action viewed as complete or as incomplete (for details see van Eynde 1988).",
"cite_spans": [],
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"section": "INTRODUCTION",
"sec_num": null
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"text": "All Slavic languages on the other hand have a wellformed aspect system where verbs have a perfective and an imperfectivc aspect derived from the verbal stem by affixation. The translation of verbal groups from English into Russian, for example, seems to be possible by formulating rules which assign concrete Russian aspect forms to several combinations of tense and aspect in English, e.g.",
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"section": "INTRODUCTION",
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"text": "has been giving (present perfect continuous) -> zr~Ba/r (past, imperfective aspect) has given (present perfect) --> ~ra~ (past, perfective aspect) (ef. Apresjan 1989: 154) .",
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"start": 56,
"end": 83,
"text": "(past, imperfective aspect)",
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{
"start": 152,
"end": 171,
"text": "Apresjan 1989: 154)",
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"section": "INTRODUCTION",
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"text": "In contrast to the languages mentioned above, aspect meaning in German, which doubtlessly exists, has no explicit formal expression. Therefore, aspect information required for translation into Russian has to be extracted from different levels of text representation. This is necessary since without the correct choice of Russian aspect serious translation errors in the target language could occur. In our German-Russian MT project VIRTEX we have approached this problem by constructing a hierarchic procedure for aspect choice (presented in the next paragraphy which takes a complex of contextual, morphological and semantical criteria into account. If the aspect choice algorithm fails to select one of the two aspect forms, wider context (beyond the bound-aries of sentence) or background knowledge must be taken into consideration. To meet this difficulty VIRTEX is provided with a system of inquiries. If necessary, human interaction is entered to make a final decision (in the sense of Personal MT, see Boitet 1990) . A more perfect solution can only be reached by a more sophisticated text and knowledge representation including aspectual characteristics. ",
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"start": 1009,
"end": 1021,
"text": "Boitet 1990)",
"ref_id": "BIBREF1"
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"section": "INTRODUCTION",
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"text": "If none of the aforesaid criteria applies some German tenses determine the aspect choice:",
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"section": "Tense",
"sec_num": "4."
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"text": "Past perfect is translated to perfective aspect form, in the case of the present tense (pracsens futuri excluded) the imperfective aspect is preferred. ",
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"section": "Tense",
"sec_num": "4."
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"text": "In the case of the remaining tense forms (not listed in 4.), choice of aspect depends on the verbal semantics.",
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"section": "Aktionsart Type and Additional Conditions",
"sec_num": "5."
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"text": "There are distinctions between durative verbs (warren 'to wait', diskutieren 'to discuss'), verbs with a resultative meaning (ertu)hen 'to raise', definieren \"to define') or verbs such as aufz/lhlen 'to enumerate', produzieren 'to produce', which are characterized by such properties as limitedness, repeafibility, general faetitive meaning, named IIM+ITER in fig. I . In these cases the existence of a direct object, its number and definiteness (N4 PLUR, N4 BET in fig. 1 ) must be taken into consideration. 'The student was writing a letter.'",
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"start": 360,
"end": 366,
"text": "fig. I",
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"start": 466,
"end": 472,
"text": "fig. 1",
"ref_id": "FIGREF2"
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"section": "Aktionsart Type and Additional Conditions",
"sec_num": "5."
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"text": "In the first version of VmTEX designed without a user dialogue we preferred the interpretation by:which the denoted action is assumed to be completed and consequently the perfective aspect is chosen (see: (la) (2) Er ~st die Aufgaben rechtzeitig. Then we have in mind rather a certain property than a concrete action of the person specified in the subject position. A context suggesting this reading could be a characterization of the student.",
"cite_spans": [],
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"section": "Aktionsart Type and Additional Conditions",
"sec_num": "5."
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"text": "To test whether this reading is meant the user is invited to compare the original sentence with \"Er l~st die Aufgaben in der Re~el rechtzeitig.\" 'As a rule he solves the tasks in time.' If the insertion is possible without changing the sentence meaning, the imperfective aspect of the verb will be chosen, otherwise we assume that the future interpretation holds, which is expressed by the per fective aspect.",
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"section": "Aktionsart Type and Additional Conditions",
"sec_num": "5."
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"text": "Another class of verbs (such as herstellen 'to produce', exportieren 'to export', verkaufen 'to sell') causes a type of ambiguity as shown in (3):(3) Der Trabant wurde in der DDR verkaujg. In order to avoid the terms 'type' and 'token' within the dialogue, two sentences are offered to the user. He must decide which of them is more suitable to be used as a paraphrase of the original sentence. With our example, he must select between \"Dieses Ob/ekt wurde in der DDR verkaufl\" 'This object was sold in the GDR' and \"Di__ge Objekte wurden in der DDR verkaufl\" 'The objects were sold in the GDR'. If the user prefers the first paraphrase, the Russian perfcctivc aspect will be used, otherwise the irnperfcctive one. OH pa3pa6aT~Ba:\u00a2 n:mu~. (i.asp.) 'He has worked out plans.' 4bOH pazpaSoTag\u00a2 IrZaHH. (p.asp.) 'He has worked out plans.'",
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"start": 739,
"end": 747,
"text": "(i.asp.)",
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"start": 800,
"end": 808,
"text": "(p.asp.)",
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"section": "Type / Token",
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"text": "The imperfective meaning (sec (4a)) is inherent in the source sentence when it is interpreted in the following way: a person has gained some experience in working out plans, maybe it was his professional task. Such a translation underlines the general faetitive meaning which can be emphasized by using the adverbials irgendwann einmal, eine Zet#ang 'some time (during his life)': \"Er hat irgendwann einmal / eine Zeitlang Plane ausgearbei- To test which of the two readings is the appropriate one, the system offers a sentence with the inserted adverbs as mentioned above, and the user is requested to compare its meaning with that of the sentence to be translated.",
"cite_spans": [],
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"section": "Type / Token",
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"text": "The preference of (4a) to (4b) assumed by VIRT~ would be the converse if the direct object were definite.",
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"section": "Type / Token",
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"text": "Further types of aspectual ambiguity may occur. In addition, within one aspect form it may become necessary to resolve temporal ambiguities, e.g.: Cry~eur, Bepo~TuO, c~a~ 3I\u00a23a~eu.",
"cite_spans": [],
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"section": "Type / Token",
"sec_num": null
},
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"text": "'The student probably passed the exam.' Sentences (Sa) and (Sb) exemplify that future perfect in German does not only express future events but more ol~en expresses a presumption with regard to events, actions, etc. which took place in the past. The latter interpretation could be indicated by adverbs which semantically contradict the future interpretation. These are adverbs of anteriority denoting spans or points of time in the past such as gestern 'yesterday', eben / gerade 'just' or letztes Jahr 'last year'. In this ease the choice of the proper aspect form depends on the semantic subclass of the associated verb. For non-durative verbs the perfective aspect must be chosen, for durative verbs -the imperfective one. On the other hand, adverbs of posteriority underline the future tense interpretation.",
"cite_spans": [],
"ref_spans": [],
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"section": "Type / Token",
"sec_num": null
},
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"text": "Without such adverbials the sentence remains ambiguous.",
"cite_spans": [],
"ref_spans": [],
"eq_spans": [],
"section": "Type / Token",
"sec_num": null
},
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"text": "Adverbs of simultaneity and those deietie adverbs which can express simultaneity as well as anteriority and posteriority do not contribute to disambiguating future perfect sentences because they allow for both interpretations.",
"cite_spans": [],
"ref_spans": [],
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"section": "Type / Token",
"sec_num": null
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"text": "To solve the ambiguity in example (5) the inquiry might be: \"Nehmen Sic an, da[3 dos bereits erfolgt ist?\"",
"cite_spans": [],
"ref_spans": [],
"eq_spans": [],
"section": "Type / Token",
"sec_num": null
},
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"text": "'Do you think that it already happened?'",
"cite_spans": [],
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"section": "Type / Token",
"sec_num": null
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"text": "When formulating the inquiries of the dialogue component, we followed the principle that the questions to be answered by the user should be made as precise and simple as possible and should not presuppose any special knowledge in linguistics.",
"cite_spans": [],
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"section": "Type / Token",
"sec_num": null
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"text": "The above examples show the necessity of taking wider context into account if the sentences are too short to make a weUfounded choice of aspect and tense. As a preliminary solution the integration of inquiries into the system was proposed. For practical use such inquiries may be very helpful because they allow us to improve the translation of isolated sentences and, moreover, of sentences taken from texts. Nevertheless, from the linguistic point of view there has to be further investigation in the field of semantics for the automatic generation of the appropriate aspect forms.",
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"section": "CONCLUSIONS",
"sec_num": null
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"text": "In future we plan to treat aspect and tense by expressing them in a deep semantic representation. This forces us to include wider context beyond sentence boundaries or extralinguistie knowledge, e.g. style and text typology, This can be done either in an interactive way as proposed in this paper or by means of knowledge based MT.",
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"section": "CONCLUSIONS",
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"BIBREF0": {
"ref_id": "b0",
"title": "Linguistideskoe obespedenie sistemy ETAP 2",
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"D"
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"suffix": ""
}
],
"year": 1989,
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"pages": "",
"other_ids": {},
"num": null,
"urls": [],
"raw_text": "Apresjan, Juri D. et al. 1989: Linguistideskoe obespe- denie sistemy ETAP 2. Moskva.",
"links": null
},
"BIBREF1": {
"ref_id": "b1",
"title": "Towards Personal MT: general design, dialogue structure, potential role of speech",
"authors": [
{
"first": "Christian",
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}
],
"year": 1990,
"venue": "Proceedings of COLING-90",
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"links": null
},
"BIBREF2": {
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"title": "Aspect Meanings of Russian Verbs'). In: Voprosy jazykoznanija",
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"links": null
},
"BIBREF3": {
"ref_id": "b3",
"title": "VIRTEX -a German-Russian Translation Experiment",
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{
"first": "R",
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{
"first": "I",
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"last": "Hfser",
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{
"first": "G",
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{
"first": "A",
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"other_ids": {},
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"urls": [],
"raw_text": "Buschbeck, B., R. Henschel, I. Hfser, G. Klimonow, A. Kfistner, and I. Starke 1990: VIRTEX -a German- Russian Translation Experiment. Proceedings of COLING-90, Helsinki, Vol.3:321-323.",
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"BIBREF5": {
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"title": "The Analysis of Tense and Aspect in Eurotra",
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"year": 1988,
"venue": "The Third International Conference on Theoretical and Methodological Issues in Machine Translation of Natural Language",
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"raw_text": "Somers, Harold L. 1990: Current Research in Machine Translation. In: The Third International Conference on Theoretical and Methodological Issues in Machine Translation of Natural Language, 11-13 June 1990, University of Texas, Austin. van Eynde, Frank 1988: The Analysis of Tense and Aspect in Eurotra. In: Proceedings of COLING-88, Budapest, Vol.2:699-704.",
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"links": null
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"ref_entries": {
"FIGREF0": {
"uris": null,
"num": null,
"text": "perfect is translated into future using the perfective aspect if there is no indicator of subjunctive meaning which is expressed in Russian by the preterite form an and insertion of BepoflTnO 'probably'(see the symbol PRT+VEROJ^TNO in fig.l).",
"type_str": "figure"
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"FIGREF1": {
"uris": null,
"num": null,
"text": "For details seefigure 1showing the aspect choice algorithm for active voice sentences implemented in VIRTEX. Some of the strict decisions in this algorithm are preferential ones as will be discussed in the next paragraph. In the case of the passive voice or of modal constructions, different sequences of conditions are I lexical criteria 9r lexeme-specific valency frame conditions",
"type_str": "figure"
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"FIGREF2": {
"uris": null,
"num": null,
"text": "The VIRTEX aspect choice algorithm for active voice checked in combination with the operations of passive to active transformation (if necessary) or structural transfer for certain modal constructions. THE ROLE OF CONTEXT When translating isolated sentences into Russian the absence of information about how to interpret the verbal meaning from an aspectual point of view causes major problems. Often the sentence is too short to fred indicators allowing for a decision between several possible interpretations (of. Somers 1990) which would lead to different results of aspect choice. In such cases it is obvious that by using formal criteria an unambiguous solution is not possible. In other words: the rigid aspect choice algorithm implemented in VmTEX at first compelled us to make preferential decisions although we have been aware of the fact that sometimes another interpretation of the sentence to be translated would not be captured. In the following we shall show with five examples how certain contexts help us to clarify the intended interpretation of the given sentence in order to choose the proper aspect form. Here the term 'context' refers to what is expressed in the text surrounding the sentence to be translated or to the user's background knowledge about the text. As long as this kind of knowledge is not accessible, it shall be introduced by means of a dialogue component. Current Process I Result (1) Der Student schrieb einen Brief. (la) CTyZOHT ~anlcca:~ nHCbUO. (p.asp:)'The student wrote/has written a letter.' (lb) CTy,\u00a3eUT nHcaJI rrHcbuo. (i.asp.)",
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"FIGREF3": {
"uris": null,
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"text": "OH pollIHT 3a~a ~rH so-Bpez4~. (p. asp.) 'He will solve the tasks in time.' (2b) Os peruser aa~a tnf BO-BpeU~. (i.asp.) 'He solves the tasks in time.' An indicator for the praesens futuri interpretation leading to the translation (2a) would be a context like \"Morgen mu~ der Student die Arbeit abgeben. Ich bin sicher: Er ll~st die Aufgaben rechtzeitig. \" 'Tomorrow the student has to submit the paper. I am sure: he will solve the tasks in time.' In this case the perfective aspect is necessary. But it is also possible to assign the sentence an iterativeJhabitual interpretation leading to sentence (2b).",
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"FIGREF4": {
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"text": "5~ur rrpozraH B FzTP. (p.asp.) 'The Trabant car was sold in the GDR.' (3b) Tpa6al4T rtpo~aBayIc~ B Fz~P. (i.asp.) 'The Trabant car was sold in the GDR.' In a context like \"Au{3erhalb des Landes stieB der Trabant aufAbsatzschwierigkeiten.\" 'Abroad the Trabant car met with sales resistance.' sentence (3) describes a frequentative process. In another context a single event of verkaufen 'to sell' could be meant: \"Die Polizei befaBt sich noch immer mit dera Unfallauto. Es ist jetzt sicher: Der Trabant wurde in der DDR verkaufl. \" 'The police is still investigating the car damaged in the accident. Now it is clear: the Trabant car was sold in the GDR.' You may observe in our example that the aspectual ambiguity is interrelated with an ambiguity of the semantic object: whereas in the first reading i t refers to a set of objects, Trabant is type, ill the second reading it denotes one concrete individual -Trabant is token. The distinction between type and token requires deeper semantic analysis which is impossible without contextual knowledge.",
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"FIGREF6": {
"uris": null,
"num": null,
"text": "tel.\" 'Some ti..m.\u00a2 he worked out plans.' This is the preferred reading in the V]RTEX aspect choice algorithm. Nevertheless, the sentence also can suggest a concrete, completed action, e. g., if the context refers to the result of this action as in \"Er hat Plane ausgearbeitet. Sic liegen zur Ansicht aus.\" 'He has elaborated plans. They are open to inspection.' In this case the translation must use the perfcctive aspect.",
"type_str": "figure"
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"FIGREF7": {
"uris": null,
"num": null,
"text": "Der Student wird die Prflfung abgelegt haben.",
"type_str": "figure"
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"content": "<table><tr><td/><td>A SET OF FORMAL CRITERIA</td></tr><tr><td/><td>USED BY VIRTEX</td></tr><tr><td/><td>FOR DETERMINING ASPECT AND TENSE</td></tr><tr><td/><td>The MT system VIRTEX is made to translate simple</td></tr><tr><td colspan=\"2\">German main clauses into Russian including the decision</td></tr><tr><td colspan=\"2\">of appropriate aspect forms for simple and complex</td></tr><tr><td colspan=\"2\">verbal groups. We distinguish five different types of</td></tr><tr><td colspan=\"2\">criteria all of them operating on the level of a syntactic</td></tr><tr><td colspan=\"2\">surface structure enriched by semantic features:</td></tr><tr><td/><td>1. Lexkai Information</td></tr><tr><td/><td>German verbs which in every context denote</td></tr><tr><td colspan=\"2\">non-resultative activities are always translated by a Russian verb in imperfective aspect form, e.g. arbeiten 'to work' -&gt; pa6OTaTT~. A contrasting class of verbs (siegen 'to win', er-</td><td>preferred. Within the aspect choice algorithm (see fig. 1) these two classes of adverbs were named ADV-I and ADV-P.</td></tr><tr><td colspan=\"2\">reichen 'to achieve') which represents achievements (see</td></tr><tr><td colspan=\"2\">Vendler 1967) can be translated in an analogous way into</td></tr><tr><td colspan=\"2\">perfectiv\u00a2 aspect forms unless the context suggests</td></tr><tr><td colspan=\"2\">iterativity.</td></tr><tr><td/><td>2. Valency Frames</td></tr><tr><td/><td>Some verbs allow different readings concerning their</td></tr><tr><td colspan=\"2\">semantics. These may be distinguished by the occurrence</td></tr><tr><td colspan=\"2\">of certain verbal complements:</td></tr><tr><td colspan=\"2\">(a) Er schrieb an einem Brief.</td></tr><tr><td/><td>'He was writing a letter.'</td></tr><tr><td/><td>-&gt; Ou Iruca:I nHCbMO. (i.asp.)</td></tr><tr><td colspan=\"2\">(b) Er schrieb einen Brief.</td></tr><tr><td/><td>'He was writing/wrote/has written a letter.'</td></tr><tr><td/><td>-&gt; Ou rr~tca~/uan~ca~ nuc~uo.</td></tr><tr><td/><td>(both aspect forms are possible)</td></tr><tr><td/><td>Furthermore, there are German verbs which include</td></tr><tr><td colspan=\"2\">several semcmes differing with regard to their termina-</td></tr><tr><td colspan=\"2\">tive/aterminative usage (cf. Mehlig 1988). Such a verb is,</td></tr><tr><td colspan=\"2\">e. g., the verb sprechen 'to speak'. For translating the</td></tr><tr><td colspan=\"2\">terminative reading of the verb -sprechen mit jmdm. 'to</td></tr><tr><td colspan=\"2\">talk with sb.' -in Russian both aspect forms can be</td></tr><tr><td colspan=\"2\">used: roBopHT~/IrOroBopHT~ c xeu. Theaterminative</td></tr><tr><td colspan=\"2\">reading of sprechen does not occur in connection with</td></tr><tr><td colspan=\"2\">the preposition mit 'with'. In Russian the imperfective</td></tr><tr><td colspan=\"2\">aspect must be chosen:</td></tr><tr><td/><td>Er sprach (vor Studenten) aber Werkstoffe.</td></tr><tr><td/><td>'He spoke (to the students) about materials.'</td></tr><tr><td/><td>-&gt; Ou ro~opn~ (*noro~opu~) (~epe~</td></tr><tr><td>,</td><td>CTyAeHTaMH) 0 UaTepua2rax.</td></tr></table>",
"text": "Such temporal distinctions of verb readings make it to some extent possible to choose the appropriate aspect form already with the help of the dictionary only.3. Adverbial SemanticsVarious types of adverbials may help to arrive at a decision. In cooecurrence with durative, iterative or intensity adverbials (e.g. den ganzen Tag lang 'all day long', h~ufig 'frequently', mehr und mehr 'more and more'), the imperfective aspect is chosen. If there are adverbials of punctual meaning (pl~tzlich 'suddenly', date, time) or of future events (demndchat 'soon') and no adverbial of the former class, the pcrfective aspect is"
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}