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2. Present perfect - Wikipedia

   en.wikipedia.org/wiki/Present_perfect

   The present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has present consequences. [ 1] The term is used particularly in the context of English grammar to refer to forms like "I have finished". The forms are present because they use the present tense of the auxiliary verb ...

3. Perfect (grammar) - Wikipedia

   en.wikipedia.org/wiki/Perfect_(grammar)

   The word perfect in this sense means "completed" (from Latin perfectum, which is the perfect passive participle of the verb perficere "to complete"). In traditional Latin and Ancient Greek grammar, the perfect tense is a particular, conjugated -verb form. Modern analyses view the perfect constructions of these languages as combining elements of ...

4. Perfective aspect - Wikipedia

   en.wikipedia.org/wiki/Perfective_aspect

   A perfect tense (abbreviated PERF or PRF) is a grammatical form used to describe a past event with present relevance, or a present state resulting from a past situation. For example, "I have put it on the table" implies both that I put the object on the table and that it is still there; "I have been to France" conveys that this is a part of my ...

5. Uses of English verb forms - Wikipedia

   en.wikipedia.org/wiki/Uses_of_English_verb_forms

   The choice of present perfect or past tense depends on the frame of reference (period or point in time) in which the event is conceived as occurring. If the frame of reference extends to the present time, the present perfect is used. For example: I have written a letter this morning. (if it is still the morning) He has produced ten plays.

6. Latin tenses - Wikipedia

   en.wikipedia.org/wiki/Latin_tenses

   The perfect indicative active tense is the third principal part given in Latin dictionaries. In most verbs it uses a different stem from the present tense; for example, the perfect tense of dūcō 'I lead' is dūxī 'I led'. 1st conjugation: amāvī (-ī, -istī, -it, -imus, -istis, -ērunt/-ēre) 2nd conjugation: vīdī; 3rd conjugation (-ō ...

7. Grammatical aspect - Wikipedia

   en.wikipedia.org/wiki/Grammatical_aspect

   v. t. e. In linguistics, aspect is a grammatical category that expresses how a verbal action, event, or state, extends over time. For instance, perfective aspect is used in referring to an event conceived as bounded and unitary, without reference to any flow of time during the event ("I helped him"). Imperfective aspect is used for situations ...

8. Sequence of tenses - Wikipedia

   en.wikipedia.org/wiki/Sequence_of_tenses

   In Latin, the sequence of tenses rule affects dependent verbs in the subjunctive mood, mainly in indirect questions, indirect commands, and purpose clauses. [4] If the main verb is in one of the non-past tenses, the subordinate verb is usually in the present or perfect subjunctive (primary sequence); if the main verb is in one of the past tenses, the subordinate verb is usually in the ...

9. Future perfect - Wikipedia

   en.wikipedia.org/wiki/Future_perfect

   Future perfect. The future perfect is a verb form or construction used to describe an event that is expected or planned to happen before a time of reference in the future, such as will have finished in the English sentence "I will have finished by tomorrow." It is a grammatical combination of the future tense, or other marking of future time ...