since从句的用法之一since从句后接过去式还是完成式

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since从句的用法之一since从句后接过去式还是完成式
since从句的用法之一
since从句后接过去式还是完成式

since从句的用法之一since从句后接过去式还是完成式
是这样的 since从句后可以接一般过去式,也可以接现在完成式.
I have learned a lot from her since I have known her.(后面的动词必须是无限的持续性的,不能是瞬间动词).如不能说 It's ten years since his father has died.die 是瞬间动词,改为:It's ten years since his father died.这就是接一般过去式了.总之,接现在完成式时since翻译为“在\自...期间”.

通常后接一般过去式前面使用现在完成时或一般现在时。如:
It has been three years since his grandfather died.或It is three years since his grandfather died.

用一般过去时,前面的主句用现在完成时或一般现在时。
it is five years since we came here.
we have been here since we came here.

since从句后接过去式。
例如: I have been in China since I { came } to Beijing two years ago.