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四.目的状语从句 I) so that, in order that和in case, lest 等引导的目的状语从句 so that , in order that 常与may, can, could, might等情态动词连用 In order that he shouldnt wake up his wife, he came in quietly. Ⅱ) in case, lest 引导的目的状语从句多用虚拟语气结构：should + v. 原形，意为以防、以免。 例如： He ran away lest he be caught. I hid the book in case she should see it. 我把书藏起来，以防被她看到 | 
