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首先了解if引导的虚拟语气
对过去的虚拟：
if sb had done sth,sb would/could/should have done sth.
对现在的虚拟：
if sb did/were...,sb would/should/could/might dodo.
对将来的虚拟：
if sb were to do或者是if sb should do,sb would /should do
然后进行倒装，主句（后半段句）不变，if引导的从句中谓语部分如果有had,were,should的把这些放to d面来if省略掉其他的没什么变化。就是变成了had sb done,sb would have do.和were sb...,sb would do.和were sb to do,sb would dodo.和should sb do,sb would do.
对过去的虚拟：
if sb had done sth,sb would/could/should have done sth.
对现在的虚拟：
if sb did/were...,sb would/should/could/might dodo.
对将来的虚拟：
if sb were to do或者是if sb should do,sb would /should do
然后进行倒装，主句（后半段句）不变，if引导的从句中谓语部分如果有had,were,should的把这些放to d面来if省略掉其他的没什么变化。就是变成了had sb done,sb would have do.和were sb...,sb would do.和were sb to do,sb would dodo.和should sb do,sb would do.
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