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■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 doesnt 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:
Ill 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, Ill go and tell the manager that you are here. 请等一下,我去告诉经理说你来了。
下一篇: 状语从句知识点总结:时间状语从句
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