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　　②目的状语从句

　　a.由in case, lest, for fear that引导的目的状语从句，动词用“should +动词原形”结构，表示忧虑或目的。

　　Please remind me of it again tomorrow in case I (should) forget.请你明天再提醒我这件事，以免我忘记。

　　She emphasized it again and again, lest he (should) forget.她一再强调这一点免得他忘记。

　　We had a meeting and talked the matter over face to face for fear that there

　　should be any misunderstanding.

　　我们开了一个会，面对面谈了这件事，以免发生误会.

　　b.在in order that和so that引导的目的状语从句中，往往用can(could)或may(might)。

　　I shall write down your telephone number so that I may not forget.我要把你的电话号码记下来，以免忘记。

　　They worked harder than usual in order that they could finish the work ahead of time.为了能提前完成工作，他们比往常更加努力。

　　We will tell you the truth so that you can judge for yourself.我把真实情况告诉你，使你能自己作出判断。