Question

【现在完成时】have+点动词+since…\for…可以吗？

先说明，be，have，keep，know，learn，lie，live，read，sing，sleep，stand，stay，wait，walk，watch…是持续性的。
我需要详解+例句，谢谢
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一定要详细啊！再次谢谢。

Answer 1

一般情况下，瞬间动词不具备延续性，所以是不可以和since/for段时间连用的。比如不可以讲：I have left for five days.要转成I have been away for five days.
瞬间性动词可以和点时间连用。比如I have already left. He has just left.这样的时间状语有already/just/recently/lately/yet/ever/once/several times/this morning/today/now/this year等。
延续性动词可以和since/for/all等段时间连用。
瞬间动词的否定式倒是具备延续性。可以和段时间连用。比如可以讲He hasn't left for five days.
有时瞬间动词连续重复发生时也具备延续性。比如可以说：He has often written to me since he left.
瞬间动词若想用段时间一般要转换成相应的延续动词。
buy/borrow/get---keep /have
die-----be dead
come/arrive------be here
go/leave-----be away