1、when可指时间点,又可指时间段,从句中可用延续性动词,也可用非延续性动词。<br>2、表示主句的动作发生在从句的较长动作过程中,when, as均可使用。从句中为be动词时,多用when。<br>3、when是at or during the time that, 既指时间点,也可指一段时间。<br>4、when 说明从句的动作和主句的动作可以是同时发生,也可以是先后发生。<br>5、由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时。<br>扩展资料:<br>1、回答 when 引导的从句,不一定指出具体的时间点。如回答句(1)可用 tomorrow, next month 等。而回答 what time 引导的问句,则必须说出具全的时间点,如 at two o'clock, at five past ten 等。<br>2、由 when 等引导的状语从句,如果主语与主句的主语一致或是 it ,谓语动词又含 be 动词时,主语和 be 动词常常被省略,就变成“ when + V-ing/ V-ed/ adj/ 介词词组”的结构。<br>参考资料来源:搜狗百科-when
Doing the washing up,Connie was planning her holiday.康妮在洗碗的时刻盘算着怎样度假。The students came into the classroom .学生们又说又笑地走进了教室。As she saw me,she came over. 她看到我时,笑容可掬地走过来。 可表示 行为在主要动作之前或之后。 Antonio remembered sending his mother an email three times last month. 安东尼记得上个月给他母亲发了三次电子邮件.(在前) Mr. Lee went out behind him. 李先生出去后将门随手关上。(在后) 2. v.- -g ing 形式的完成式 v.-ing 形式的完成式由“having + v.-ed 形式”构成,表示动作发生在谓语动词表示的动作之前 ,而时态的表达主要靠谓语动词来加以确定。 I could not recall having heard anyone say that before。我不记得以前听过谁说这样的话。 Having finished his homework,he went to bed. 做完了作业,他去睡觉了。(先“做作业”,后“去睡觉”) He doesn’t remember that.他忘记了曾经答应过我那件事。 She regretted .她很后悔没看这部电影。 I remember you speak on that subject.我记得曾经听见你谈过这个问题。 That weekend,for a while,I went to the library to borrow some new novels. 那个周末,我看了一会儿电视,便去了图书馆借了几本新小说。 ,he has made up his mind to work harder from now on. 他认识到考试失败的原因后,下决心从现在开始要更加努力地学习。 The decision ,the next problem was how to make a good plan. 决定已作出,下一个问题是如何制订一个好计划了。 3. v.- - ing 形式的被动式 -ing形式的一般时的被动式由“being + v.-ed形式”构成,表示主语是v.-ing形式的动作的承受者。