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what is present perfect tense

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 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.