they would/could/should have completed the job in a few hours
if..had done ,should/could /would/ have done.
与过去愿望或事实不符的虚拟语气
if后加过去完成时,主句怎么变if there had not been a hard layer of rock be
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if there had not been a hard layer of rock beneath the soil,
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If there had not been a hard layer of rock beneath the soil
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If there had not been 改成 had not there been
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she looked as if she were made of ice 主句用了过去时 为什么从句不用过去完成时
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if there may not be .
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if条件句虚拟语气:①过去虚拟:if用had done,主句用would have done②对现在虚拟:if用did,
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It would not have been better if it had been a little bit co
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If it were not for… If it had not been for … but for… 有什么关系和
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1.if it had not been for your timely assistant.