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Perfect tenses are named thus because they refer to actions that are finished with respect to the present (or some other time under consideration); for example, "I have eaten all the bread" refers to an action which is, as of now, completed. However, as seen above, not all uses of present perfect constructions involve an idea of completion.
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 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.
Most verbs have three or four inflected forms in addition to the base form: a third-person singular present tense form in -(e)s (writes, botches), a present participle and gerund form in -ing (writing), a past tense (wrote), and – though often identical to the past tense form – a past participle (written).
In Ancient Greek the infinitive has four tenses (present, future, aorist, perfect) and three voices (active, middle, passive). Present and perfect have the same infinitive for both middle and passive, while future and aorist have separate middle and passive 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 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 ...
Present perfect progressive (progressive, perfect): "I have been eating" (While many elementary discussions of English grammar classify the present perfect as a past tense, it relates the action to the present time. One cannot say of someone now deceased that they "have eaten" or "have been eating". The present auxiliary implies that they are ...