Jack have drunk for 3 hours and fell asleep.
There's nothing wrong with him. He've just been drinking too much.
mosja Is present perfect con. appropriate? Yes.
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mosja Is present perfect con. appropriate?
Yes. Use that tense, as shown below.
After a singular subject it's has, not have.
Jack has been drinking and (he) has fallen asleep.
mosjaThere's nothing wrong with him.He'veHe's (=He has) just been