if引导的从句的用法有哪些?

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if引导的从句的用法有哪些?

1 用于一般疑问句变宾语从句 if 为引导词 意思是“是否”
I want to know if he can come.
2 if 引导条件状语从句 意思是“如果”
If he walks to school at 6:50am ,he will be late for school
3 if引导虚拟语气
If I were you,I would do it well.

if主要引导条件状语从句,后半句即主句为将来时,从句则应为现在时。
例如:If he walks to school at 6:50am ,he will be late for school.(这里引导未发生或可能发生的事,表事情发生的条件)
if引导虚拟语气
例如:If I were you, I would go with him.主句用过去将来式,从句为过去式(这里...

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if主要引导条件状语从句,后半句即主句为将来时,从句则应为现在时。
例如:If he walks to school at 6:50am ,he will be late for school.(这里引导未发生或可能发生的事,表事情发生的条件)
if引导虚拟语气
例如:If I were you, I would go with him.主句用过去将来式,从句为过去式(这里引导已发生或不可能发生的事,表假设)

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虚拟语气,主将从现时态啊