if虚拟条件句的省略.(虚拟条件句都是由连词if引导)
虚拟条件句中,if可省略,造成were/had提前,产生倒装.
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另外供楼主参考虚拟条件句:
虚拟条件句
1与现在事实相反,从句谓语用动词过去式(be动词一般用were);主句用should(would,could,might) do
2与将来事实相反:从句谓语可用动词过去式,should do动词原形或者用were to do;主句谓语形式也是用should(would,could,might) do
3,与过去相反的事实,从句中用had done;主句谓语是由should(would,could,might) have done
例句上面有,不再赘述