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The implications of the present perfect (that something occurred prior to the present moment) are similar to those of the simple past, although the two forms are generally not used interchangeably—the simple past is used when the time frame of reference is in the past, while the present perfect is used when it extends to the present. For ...
No particular past time frame is specified for the action/event. When a past time frame (a point of time in the past, or period of time which ended in the past) is specified for the event, explicitly or implicitly, the simple past is used rather than the present perfect. The tense may be said to be a sort of mixture of present and past.
The past tense (simple past or past progressive) of the condition clause is historically the past subjunctive. In modern English this is identical to the past indicative , except in the first and third persons singular of the verb be , where the indicative is was and the subjunctive were ; was is sometimes used as a colloquialism ( were ...
Proto-Indo-European verbs had present, perfect , imperfect and aorist forms – these can be considered as representing two tenses (present and past) with different aspects. Most languages in the Indo-European family have developed systems either with two morphological tenses (present or "non-past", and past) or with three (present, past and ...
The present perfect is often used also for completed events where English would use the simple past. For details see Italian grammar. Spanish uses haber ("have") as the auxiliary with all verbs. The "present perfect" form is called the pretérito perfecto and is used similarly to the English present
Unlike the present perfect, the past perfect can readily be used with an adverb specifying a past time frame for the occurrence. For example, it is incorrect to say * I have done it last Friday (the use of last Friday , specifying the past time, would entail the use of the simple past , I did it , rather than the present perfect).
There are indicative mood forms for, in addition to the future-as-viewed-from-the-past usage of the conditional mood form, the following combinations: future; an imperfective past tense–aspect combination whose form can also be used in contrary-to-fact "if" clauses with present reference; a perfective past tense–aspect combination whose ...
For example, NPST non-past is not listed, as it is composable from N-non-+ PST past. This convention is grounded in the Leipzig Glossing Rules. [2] Some authors use a lower-case n, for example n H for 'non-human'. [16] Some sources are moving from classical lative (LAT, -L) terminology to 'directional' (DIR), with concommitant changes in the ...