虚拟条件句中如果谓语动词含有were,should,had这几个词,可以把were,should,had放在if的位置,并去掉if：这就是虚拟条件句的倒装.但已经没有if了.如：If
he had come yesterday,he would have known it.=Had he come yesterday,he would
have known it.If I were there,I would help them.=Were I there,I would
help them.If I should have 200,000 yuan,I would buy a good car.=Should I
have 200,000 yuan,I would buy a good car.
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