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In modern English, the auxiliary verb used to form the present perfect is always to have. A typical present perfect clause thus consists of the subject, the auxiliary have/has, and the past participle (third form) of main verb. Examples: I have done so much in my life. You have gone to school. He has already arrived in America.
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).
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 perfect tense or aspect (abbreviated PERF or PRF) is a verb form that indicates that an action or circumstance occurred earlier than the time under consideration, often focusing attention on the resulting state rather than on the occurrence itself. An example of a perfect construction is I have made dinner.
An example is the verb have in the sentence I have finished my lunch. Here, the auxiliary have helps to express the perfect aspect along with the participle, finished. Some sentences contain a chain of two or more auxiliary verbs. Auxiliary verbs are also called helping verbs, helper verbs, or (verbal) auxiliaries. Research has been conducted ...
they are (third-person plural, and third-person singular) Other verbs in English take the suffix -s to mark the present tense third person singular, excluding singular 'they'. In many languages, such as French , the verb in any given tense takes a different suffix for any of the various combinations of person and number of the subject.
A study of 17th-century American English found the form be used for the 1st and 3rd person plural present; [15]: 192–193 was for the 3rd person plural preterite; [15]: 194 art and are for the 2nd person singular present; wast and wert for the 2nd person singular preterite; [15]: 193 and dost and hast (2nd person) and doth and hath (3rd person ...
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