3.在状语从句中的运用 (1)as if/as though 从句若表示非真实情况可用虚拟语气,其形式为:表示与过去事实相反时用“had+过去分词”,与现在事实相反时用“过去式”,与将来事实相反时用“would/were going to 等+动词原形”。 特别提醒:①as if还可以引导表语从句。例如: He looks as if he didn't agree to that plan. ②as if 可以跟在 look,seem,taste,smell 等连系动词后面引导一个表语从句,从句中的谓语动词所表示的情况若可能是事实的,可用陈述语气。例如: It looks as if it is going to rain. (2)in order that/so that 引导的目的状语从句中的谓语动词一般要用虚拟语气,其形式为:表示现在情况用“may/can+动词原形”,表示过去用“might/could+动词原形”。 (3)在 for fear that 和 in case 引导的状语从句中也常用虚拟语气,其形式为“should+动词原形”。例如: She put a blanket over the baby for fear that he should catch a cold. In Britain,when people go out,they are used to taking umbrellas with them in case it should rain.
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