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if they had starded earlier than expect,they would be here n

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/11 13:52:16
if they had starded earlier than expect,they would be here now
would be 为什么不能换成would have been
If they had starded earlier than expected,they would be here now.这是虚拟语气中的混合条件句.即,主句和从句假设的时间不一致.本句的从句假设时间是过去时,主句的假设时间是一般现在时.
再问: 那if my lawyer had been here last saturday ,he would have prevented me from going 怎么不用would prevent
再答: If my lawyer had been here last saturday ,he would have prevented me from going. 从句假设的时间是星期六(过去时),当然是星期六在这里的时候阻止了,所以主句也是过去时啦。
再问: would have prevented 算过去将来完成时?
再答: 不是过去将来完成时,这是虚拟语气的条件句中主句谓语动词的形式,表示与过去时间相反的假设。