目的状语从句的虚拟可以分为两类。
一、由 so that,in order that,引导的目的状语从句中,需要在从句的谓语语动词前加情态动词 can,may,could,might,前两个只用于现在时态,后两个既可以表示委婉的现在也可以表示过去,如:
* He works hard so that he can pass the exam.他努力学习,以便能够通过考试。
* He worked hard so that he could pass the exam. (当时)他刻苦地学习,以便能够通过考试。
* In order that he may pass the exam, he works hard. 为了能够通过考试,他努力学习。
* He worked hard in order that he might pass the exam. 为了能够通过考试,他当时努力地学习。
* He will come on time so that he could know everything from beginning. (委婉语气)
二、由 lest, for fear that 引导的目的状语从句,表示“以防、唯恐、免得”,之意,其谓语动词要用 should do,如:
* She tiptoed lest the guard should hear her. 她踮起脚尖走路,以免守卫发现她。
* He ran away for fear that he should be seen. 唯恐被人发现,他逃离了。
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