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。
- 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.)
- 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。
在宾语从句中的用法(详见《高一上学期英语语法重难点集汇》)
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