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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."
(There are also additional forms such as future perfect, conditional perfect, and so on.) The formation of the perfect in English, using forms of an auxiliary verb (have) together with the past participle of the main verb, is paralleled in a number of other modern European languages. The perfect can be denoted by the glossing abbreviation PERF ...
The future perfect progressive or future perfect continuous combines perfect progressive aspect with future time reference. It is formed by combining the auxiliary will (or sometimes shall, as above), the bare infinitive have, the past participle been, and the present participle of the main verb.
The base form or plain form of an English verb is not marked by any inflectional ending.. Certain derivational suffixes are frequently used to form verbs, such as -en (sharpen), -ate (formulate), -fy (electrify), and -ise/ize (realise/realize), but verbs with those suffixes are nonetheless considered to be base-form verbs.
The future perfect active originally had a short -i-, while the perfect subjunctive had a long -ī-, but by the time of Cicero the two forms had become confused. It seems that Catullus and Cicero usually pronounced the future perfect with a long ī. [168]
A verb form commonly offered as an example of such a relative tense is the imperfect of Classical Arabic. This indicates an ongoing state of affairs at the moment under discussion, which could be in the past, present or future relative to the moment of speaking. It can therefore be considered to be a relative present tense.
In the active voice only two verbs (τεθνήξω (tethnḗxō) "I will be dead" and ἑστήξω (hestḗxō) "I will be standing") have a separate form for the future perfect tense, [93] though a compound ("periphrastic") tense can be made with a perfect participle, e.g ἐγνωκὼς ἔσται (egnōkṑs éstai) [94] "he is going to ...
There is a perfect form in both tenses, which is expressed by an inflected form of the imperfective auxiliary verb έχω "have" and an invariant verb form derived from the perfective stem of the main verb. The perfect form is much rarer than in English. The non-past perfect form is a true perfect aspect as in English.