present perfect tense

1. function
-to tell what you have done recently/ lately.
-to tell what you have just or already done.
-to tell what you have never/ ever done.
-to tell what you have done so far/ up to now.
-to tell what you have done today/ this week/ this month/ this year.

2. formula
(+) subject+have/has+verb3+object
(-) subject+have/has+not+verb3+object
(?) have/has+subject+verb3+object

3.example
(+) i have been here for three years
(-) she has not been here for three years
(?) have you been here for three years?

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