since的时态和从句
扩展资料
用法
1、Since作为介词,后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。
例如: He left the village in 1982 and I haven’t seen him since then.
1982年他离开这个村子,从那以后我再没见过他。
2、Since作为副词,表示从过去以来、以后或到现在的'情形或状态,常与现在完成时态连用。
例如:He left home two weeks ago and we haven’t heard from him since.
他两周前离开了家,到现在我们一直没有他的消息。
3、接时间点
如 I have stayed in that country since 1995. 要求:谓v.用现在完成时,而且须是延续性动词。
4、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。
5、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。