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什么是条件状语从句

作者: admin来源: 网络文章 时间: 2018-11-17

引导条件状语从句的从属连词

主要的有if, unless, as [so] long as等:

You can leave now if you like. 如果你愿意现在就可以走了。

As long as it doesn't rain we can go. 只要不下雨,我们就可以去。

【注】除以上基本的引导条件状语从句的从属连词外,还有的动词尤其是其分词形式(如suppose, supposing, provided, providing等)和介词短语(如in case, on condition that等)也可用作连词表示条件:

In case I forget, please remind me about it. 万一我忘记,请提醒我一下。

I will come on condition (that) she is invited too. 如果邀请她来, 那我就来。

He may go with us provided [providing] he arrives in time. 他若及时到,就可以和我们一起走。

Suppose 和supposing 引导条件状语从句时,通常用于主句为疑问句的场合:

Suppose the boss saw you,what would he say? 如果老板看到你,他会怎样说?

Supposing he does not come, shall we go without him? 他若不来,是不是不带他去?

条件状语从句的时态

当主句为将来时态或具有将来意时,条件状语从句通常要用一般现在时表示将来意义,而不能直接使用将来时态:

I'll stay at home if it rains tomorrow. 要是明天下雨,我就呆在家里。

【注】有时也可见到 if you will 这样的说法,但那不是将来时态,而是表示意愿或委婉的请求(此处的 will是情态动词):

If you will wait for a moment, I'll go and tell the manager that you are here. 请等一下,我去告诉经理说你来了。

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