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It won't rain tomorrow,we shall go for an outing.怎么进行虚拟句型的转换

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It won't rain tomorrow,we shall go for an outing.怎么进行虚拟句型的转换?
虚拟句型的转换:
①it won't rain tomorrow,we shall go for an outing.
②if it rained tomorrow,we were to go for an outing.
第一句和第二句表达的意思是否相同?为什么?
将第一句转换为第二句,第二句的意思是否改变了?
第一句话是错的.不是虚拟了,就是一般的否定句.如果你是省略if的话要把were/were to/should/had done提前
第二句就不知道你在说什么了.
虚拟语气事这样的:
1.表示与现在事实相反:
If I did ...,I could/should/would/might do.
2.表示与过去事实相反:
If I had done ...,I could/should/would/might have done...
3.表示与将来事实相反:
If I were/was/v.ed...,
If I were to do...,
If I should do ...,
后面都+ I could/should/would/might do...