what would you do if you saw the traffic accident ,不是主将从现么if引导的条件状语从句虚拟语气的时候,主句什么时态

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whatwouldyoudoifyousawthetrafficaccident,不是主将从现么if引导的条件状语从句虚拟语气的时候,主句什么时态whatwouldyoudoifyousawthetr

what would you do if you saw the traffic accident ,不是主将从现么if引导的条件状语从句虚拟语气的时候,主句什么时态
what would you do if you saw the traffic accident ,不是主将从现么
if引导的条件状语从句虚拟语气的时候,主句什么时态

what would you do if you saw the traffic accident ,不是主将从现么if引导的条件状语从句虚拟语气的时候,主句什么时态
虚拟语气分为：与现在事实相反,与过去事实相反,与将来事实相反
第一种：与现在事实相反,从句用过去时,did或were,主句用would+动词原形
例句:If I were you,I would not study English.
第二种：与过去事实相反,从句用had done,主句是would/could/should have done
例句：If you had come yesterday,you would/should/could have seen her
第三种：与将来事实相反,从句分三种
1、与现在事实相反用法一样
2、were to do
3、should do这里should不可替换,主句用could/would +动词原形
例句
1.If you came tomorrow,you would see me
2.If you were to come tomorrow,you could/would see me
3.If you should come tomorrow ,you could/would see me

主语是过去式，根据具体情况而变。

对过去的虚拟用would have done,对现在和将来的虚拟用would+动词原形

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