作业帮【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-------------------------------------------分割线----
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【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-------------------------------------------分割线----
【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。
【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-------------------------------------------分割线----
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