虚拟语气什么时候用倒装

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if的虚拟条件句中，如果含有were，should，had等动词时，省略if并将were，should，had等词移到句首：这就是虚拟条件句的倒装
有时可将条件从句的连词if省略，但此时应用倒装句型，即把从句中的等提到句首：
If he should fail，he would kill himself. →Should he fail，he would kill himself. 万一失败，他就知会自杀。
If I were you，I would do it at once. →Were I you，I would do it at once. 假若我是你，我道就会马上做。
If I could do it，I would. →Could I do it，I would.
If I could do it，I would.
→Could I do it，I would.
要是我能做此事，我一定会做。
If he had seen you yesterday，he would haveasked you about it.
→Had he seen you yesterday，he would haveasked you about it.
他昨天要是看到了你，他就会问你这事了。
??Were I Tom，I would refuse. 如果我是汤姆，我会拒绝。
??Should it be necessary，I would go. 假若有必要，我会去的。
??Had it not been for the bad weather we would have arrived on time. 若不是天气坏，我们就准时到达了。
?
??① 若条件从句为否定句，否定词not应置于主语之后，而不能与were，should，had 等缩略成Weren’t，Shouldn’t，Hadn’t而置于句首。
??② 有时省略if后提前的had不是助动词：
Had I time，I would come. 假若我有时间，我会来的。(=If I had time)

【虚拟语气什么时候用倒装】