虚拟语气倒装,对将来的,if they were to do是were they to do,对现在的,if they did是did they do

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虚拟语气倒装,对将来的,if they were to do是were they to do,对现在的,if they did是did they do
虚拟语气倒装,对将来的,if they were to do是were they to do,对现在的,if they did是did they do

虚拟语气倒装,对将来的,if they were to do是were they to do,对现在的,if they did是did they do
前一个正确,后一个错误.
虚拟条件句的倒装
在书面语中,虚拟条件从句有时可以不用连词if而把助动词were,had或should移至主语之前.但如从句没有were,had或should则不能这样做.如:
Should he come,tell him to ring me up.他要是来了,让他给我打个电话.
Were I in your position,I would go.如果我处于你的地位,我就去.
Had they not helped us,our experiment would have failed.没有他们的帮助,我们的试验是会失败的.

没有,对现在、将来的虚拟都可以用if they were to do或were they to do,但if they did没有did they do 这样的用法

正确。

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