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引导条件状语从句的从属连词有if, unless (=ifnot如果不,除非), as/so long as(只要), while(=as long as只要), supposing (that)/provided /providing (that)(假如), in case(假使), on condition that(在的条件下)等。如:
You can learn anything so long as you set your mind to learn it. 用心学本领,总能学到手。
I will go there tomorrow unless it rains.(=if it doesnt rain)除非下雨,否则我明天要去那儿。
He will do the work providing you pay him. 如果你能付费,他可以做这工作。
In case l forget,please remind me about it. 如果我忘了,请提醒我。
Well let you use the room on condition that you keep it clean and tidy. 我们可以让你使用这个房间,条件是你把它保持整洁。
注:条件状语从句和时间状语从句一样,从句的谓语动词不能用一般将来时态、过去将来时态或将来完成时,而要用相应的一般现在时、一般过去时和现在完成时态来替代。又如:
Tell me in case you get into difficulty. 遇到困难请告诉我。
Supposing he does not come, shall we go without him? 如果他不来,是不是不带他去?
但若从句谓语用了will 或 would,那 will 或 would 则是表示愿意的情态动词。如:
If you will go with me, Ill wait for you. 如果你愿意等我,我们就帮你做这事儿。
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