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English also has a present perfect continuous (or present perfect progressive) form, which combines present tense with both perfect aspect and continuous (progressive) aspect: "I have been eating". The action is not necessarily complete; and the same is true of certain uses of the basic present perfect when the verb expresses a state or a ...
The present perfect continuous (or present perfect progressive) construction combines some of this perfect progressive aspect with present tense. It is formed with the present tense of have (have or has), the past participle of be (been), and the present participle of the main verb and the ending -ing.
The perfect can also be combined with another aspect [21] that is marked in English – the progressive (or continuous) aspect. In perfect progressive (or perfect continuous) constructions, the perfect auxiliary (a form of have) is followed by the past participle been (from be, the auxiliary of the progressive aspect), which in turn is followed ...
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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).
The third person singular present tense is formed regularly, except in the case of the modal verbs (can, shall, etc.) which do not add -s, the verb be (which has three present indicative forms: am, is and are), and the three verbs have, do and say, which produce the forms has, does (pronounced with a short vowel, /dʌz/), and says (pronounced ...
The present continuous tense has a very predictable conjugation pattern even for verbs that are typically irregular, such as essere ("to be") and avere ("to have"). For verbs with reduced infinitives, the gerund uses the same stem as the imperfect (which sometimes corresponds to the stem of the 1st person singular indicative present).
Reduplication is a hallmark of the perfect aspect system in both Latin and Ancient Greek, but some Ancient Greek verbs reduplicate the root in the progressive tenses. Reduplication can cause a lot of sound changes, including loss of aspiration, or loss of a vowel (γεν into γν in the case of γίγνομαι).