Please define "present perfect tense" with few examples.
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The PRESENT PERFECT TENSE
is formed with a present tense form of "to have" plus the past
participle of the verb (which can be either regular or irregular in
form). This tense indicates either that an action was completed
(finished or "perfected") at some point in the past or that the action
extends to the present: I have walked two miles already [but I'm still walking]. I have run the Boston Marathon [but that was some time ago]. The critics have praised the film Saving Private Ryan since it came out [and they continue to do so].
The choice between Present Perfect and Simple Past is often determined by the adverbial accompanying the verb. With adverbs referring to a period gone by, we would use the simple past: I studied all night/yesterday/on Wednesday. With adverbs beginning in the past and going up to present, we would use the present perfect: I have studied up to now/lately/already.
The choice between Present Perfect and Simple Past is often determined by the adverbial accompanying the verb. With adverbs referring to a period gone by, we would use the simple past: I studied all night/yesterday/on Wednesday. With adverbs beginning in the past and going up to present, we would use the present perfect: I have studied up to now/lately/already.
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Answer:
The perfect form is the verb tense used to indicate a completed, or "perfected," action or condition. Verbs can appear in any one of three perfect tenses: present perfect, past perfect, and future perfect.
Present Perfect: I have finished my homework already. Past Perfect: He had watched TV for an hour before dinner.
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