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since主句中带的动词时延续性还是瞬间性

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since主句中带的动词时延续性还是瞬间性
my friend died since last week
it's two weeks since my father died 这个为什么是对的?
所以根据问题主句的动词要延续性还是瞬间性.
since主句中带的动词时延续性还是瞬间性
这里since是自从…以来的意思
接一段时间 + ago:如 They have lived in that house since two years ago.要求:谓v.用现在完成时,而且须是延续性动词.
接时间状语从句:如 I have loved her since I met her last time./ Lily has stayed at home since she left school.要求:主句的谓v.用现在完成时,而且须是延续性动词;从句的谓v.用一般过去时,而且须是终止性动词