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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 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.
The first of these sentences is a basic zero conditional with both clauses in the present tense. The fourth is an example of the use of will in a condition clause [4] (for more such cases, see below). The use of verb tenses, moods and aspects in the parts of such sentences follows general principles, as described in Uses of English verb forms.
The basic (present) perfect form, with the auxiliary in the present tense, may specifically carry the meaning of perfect aspect, as in English; however in some languages it is used more generally as a past tense (or preterite), as in French and German. The use of auxiliaries and meaning of the constructions in various languages are described below.
The terms perfective and perfect should not be confused. 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 ...
The pronunciation of the past tense ending follows similar rules to those for the third person present tense ending described above: if the base form ends in /t/ or /d/ then a new syllable /ɪd/ or /əd/ is added (as in drifted, exceeded); if the base form ends in an unvoiced consonant sound other than /t/ then the ending is pronounced /t/ (as ...
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 ...
Mortlockese uses tense markers such as mii and to denote the present tense state of a subject, aa to denote a present tense state that an object has changed to from a different, past state, kɞ to describe something that has already been completed, pɞ and lɛ to denote future tense, pʷapʷ to denote a possible action or state in future tense ...