条件状语从句和其他从句一样,学好的关键都是掌握好引导词,然而除了常规引导词以外,还存在着一些特殊引导词,掌握好这些引导不仅能让你的英语水平更上一层楼,也能让你的日常交流表达更加地道。suppose和supposing:suppose和supposing可用作连词,引导条件状语从句,其意为“假若”“如果”等;此时主句通常为疑问句。eg.Supposing he can’t come, who will do the work? 假使他不能来,这工作谁做?
     Supposing he does not come, shall we go without him? 如果他不来,是不是不带他去?
     Suppose you were given a chance to study in America, would you accept? 假如给你一个到美国学习的机会,你会接受吗?
     Suppose [Supposing] (that) we miss the train, what shall we do? 假如我们误了火车,我们将怎么办?
provided和providing:虽然 providing 和 provided 形式上为动词provide的现在分词和过去分词,但它们均可用作连词,引导条件状语从句,其意为“只要”(=as long as)、“如果”(=if)等。eg. Providing [Provided] you clear your desk by this evening, you can have tomorrow off. 只要你到今晚把案头上的工作做完,你明天就可以休息。
     Providing [Providing] you promise not to tell anyone else. I’11 explain the secret. 只要你保证不告诉任何人,我就把这个秘密讲给你听。
     Provided [Providing] that you keep quiet, you can come to the concert. 只要你保持安静,你就可以去听音乐会。
     Providing there is no opposition, we shall hold the meeting here. 如果没人反对我们将在这里开会。
这类从句通常置于主句之前,但置于主句之后也是可能的。eg.I will stay here provided [providing] the climate agrees with me. 如果这里的气候合适的话,我就待下来。
     You can borrow my bike providing [provided] you bring it back. 你可以借我的自行车,只要你还给我。 
以上就是关于特殊引导词的知识点了,掌握好这些特殊引导词,不仅能够让你在考试中更有优势,更能让你在日常交流中更显地道自然,一起加油学习吧!