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He doesn’t know the answer,so he can’t put up his hands.(改为虚

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He doesn’t know the answer,so he can’t put up his hands.(改为虚拟语气)
If he ______ the answer,he ______ ______ ______ his hands.
He doesn’t know the answer,so he can’t put up his hands.(改为虚
If he knew the answer,he would put up his hands.
与现在事实相反的虚拟语气,从句中用一般过去时,主句中用would+动词原形.这句话的意思是:如果他知道答案,他会举手的.(实际上他不会,也没有举手.)