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c. 混合时间条件句的用法： 有时条件从句的动作和主句动作发生的 时间不一致。这时动词的形式，应根据它所要表达的具体时间来决定用什么形式。 1) If she hadn’t trained so hard, she wouldn’t be run so fast.(从句叙述过去，主句叙述现在。) (fact: she has trained very hard, so she would able to run fast.) 2)You would speak English well enough if you had practised reading and speaking it every day.(主句叙述现在，从句叙述过去) (fact: You didn’t practice (hasn’t practiced ) reading and speaking it every day, so you can’t speak English well enough.) 2、 在其他状语从句中的用法 主要用于由as if (as though) 引导的比较状语从句，从句中谓语动词一般用“动词的过去式(be 变were )或had +过去分词。” 如： She looked as if she were ill.(实际上她没有病，在这里用虚拟语气补语比喻她精神不佳) Xiao Liu speaks English so well as if he had studied in England.(这里用虚拟语气表现他的 英语说得好) (2)、在主语从句中的用法： 通常由形式主语it引出的主语从句来表达。主语从句中，谓语动词用“should+动词原形”;表示“必要”“重要”“奇怪”等意思。 It is necessary that you should clean the workshop after work.下班后你必须清扫车间。 It is important that we should ask advice of other people about our work.在工作中，征求别人的意见是很重要的。 (责任编辑：admin) |