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In English, completed actions in many contexts are referred to using the simple past verb form rather than the present perfect. 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 ...
The present perfect is often used also for completed events where English would use the simple past. For details see Italian grammar. Spanish uses haber ("have") as the auxiliary with all verbs. The "present perfect" form is called the pretérito perfecto and is used similarly to the English present
The present perfect may also be used with future reference, instead of the future perfect, in those dependent clauses where future occurrence is denoted by present tense (see § Dependent clauses below). For example: When you have written it, show it to me. For the possibility of a present perfect subjunctive, see English subjunctive.
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.
In standard English, for present reference there is no special grammatical marker of habitual aspect; the simple present is used, as in I go there (every Thursday). However, for past reference English uses the simple past form or either of two marked constructions: used to as in we used to go there (every Thursday) , and would as in back then ...
(The present participle and gerund forms of verbs, ending in -ing, are always regular. In English, these are used as verbs, adjectives, and nouns.) In the case of modal verbs the present and preterite forms are listed, since these are the only forms that exist with the present form identical for all persons.
The verb say displays vowel shortening in the third person present indicative (although the spelling is regular): says /sɛz/. The same shortening occurs in the past form said /sɛd/. (Compare the diphthong in the plain form say /seɪ/.) The verb wit is the only non-modal verb that is also a preterite-present verb and it does not take -s in the ...
In English the verb "to have" is used to form the perfect and past perfect tense (I have/had killed), in Finnish the verb "to be" is used instead (minä olen/olin tappanut). Just like the present active participle, it can also be used as the subject in a sentence, except it conveys the meaning in the past tense.