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user:zeman:interset:features [2014/06/16 15:48]
zeman New features split from subpos: nountype, adjtype, verbtype and conjtype. |
user:zeman:interset:features [2014/06/16 16:17]
zeman Features tense and subtense merged. |
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| ===== tense ===== | ===== tense ===== |
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| | Note: In Interset 1.0, there were two separate features, ''tense'' and ''subtense'', the latter consisting of the values ''aor'', ''imp'', ''nar'' and ''pqp''. We used to avoid hierarchical feature values (e.g. ''aor''ist implies ''past''; but many languages will only know ''past'' and their drivers will not check for the ''aor'' value). Hierarchical ordering of feature values is now normal and there are algorithms to exploit the hierarchy when a feature has to be replaced by another value, thus these two features have been merged. |
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| | Note that, unfortunately, imperfect tense is not always the same as past tense + imperfective aspect. For instance, in Bulgarian, there is lexical aspect, inherent in verb meaning, and grammatical aspect, which does not necessarily always match the lexical one. In main clauses, imperfective verbs can have imperfect tense and perfective verbs have perfect tense. However, both rules can be violated in embedded clauses. Aorist is aspect-neutral and can freely appear with both imperfective and perfective verbs. |
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| | **Value** | **Description** | | | **Value** | **Description** | |
| | pres | present | | | pres | present | |
| | fut | future | | | fut | future | |
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| ===== subtense ===== | |
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| Finer classification of tenses, may not be available in all languages. (And in many languages, these tenses are built using auxiliaries, rather than special morphemes.) Having these separated from the main past-present-future distinction allows that drivers need not check for aorist/imperfect, if they know just one past tense. | |
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| Note that, unfortunately, imperfect tense is not always the same as past tense + imperfective aspect. For instance, in Bulgarian, there is lexical aspect, inherent in verb meaning, and grammatical aspect, which does not necessarily always match the lexical one. In main clauses, imperfective verbs can have imperfect tense and perfective verbs have perfect tense. However, both rules can be violated in embedded clauses. Aorist is aspect-neutral and can freely appear with both imperfective and perfective verbs. | |
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| | **Value** | **Description** | | |
| | aor | aorist | | | aor | aorist | |
| | imp | imperfect | | | imp | imperfect | |
