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Present perfect

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They/not/sleep/two nights.

They haven't slept for two nights.

My cousin/play games/seven hours.

My cousin has played games for seven hours.

I/be/there/two o'clock.

I have been there since two o'clock.

They/know/each other/six years.

They have known each other for six years.

My dog/not/eat/four o'clock.

My dog hasn't eaten since four o'clock.

she/ever/swim/ in the lake?

Has she ever swum in the lake?

I/not drink/water/ seven o'clock.

I haven't drunk since seven o'clock.

She/be/a doctor/1996.

She has been a doctor since 1996.

He/be/a journalist/May.

He has been a journalist since May.

I/not eat/morning.

I haven't eaten since Monday.

They/never/eat/seafood.

They have never eaten seafood.

My brother/play tennis/ a long time.

My brother has played tennis for a long time.

My brother/study French/two months.

My brother has studied French for two months.

you/ever/ride an elephant?

Have you ever ridden an elephant?

We/never/eat/kiwi.

We have never eaten kiwi.