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为您整理中考必备英语语法：引导条件状语从句的从属连词有if, unless (=if…not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： 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。 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 doesn’t rain)除非下雨，否则我明天要去那儿。 We’ll 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： Supposing he does not come, shall we go without him? 如果他不来，是不是不带他去? Tell me in case you get into difficulty. 遇到困难请告诉我。 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： | 
