【人教大纲版】2017届高考英语一轮复习精品学案：SBⅠUnits 19-20_高考复习指南

　　Hadn’t it been for the captain, the ship would have sunk. (错误)

　　Had it not been for the captain, the ship would have sunk.（正确）

　　要不是船长，船早就沉了。

　　Should he come, I would not leave.

　　如果他来，我将不会离开。

　　Were the teacher to come, I would ask him for help.

　　如果老师来，我将请求他帮忙。

　　2.混合虚拟形式：

　　当从句跟主句的动作的时间不一致，这时主句和从句的谓语动词形式需要根据意思来确定。

　　①If you had followed his advice, you wouldn’t be in such trouble now.（从句说明过去，主句now说明现在）

　　你当初如果听从他的建议，现在就不会陷入这种困境了。

　　②If I were you, I wouldn’t have done the foolish thing. (从句指现在，主句指过去)

　　如果我是你，我就不会做这种傻事情。

　　3.含蓄虚拟条件句：

　　由介词(短语) but for/without（要不是）, with （有）, 连词 or, otherwise 或but 以及suppose，supposing，providing等词表示if，引出虚拟句。

　　But for/Without you, I could not be recovered so soon.

　　=If it had not been for you, I couldn’t …

　　要不是你，我不可能康复这么快。

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