[名校联盟]广东省佛山市中大附中三水实验中学八年级英语上册《语法》.ppt

* Unit 3 Language in use What were they doing when it began to rain? They were playing computer games when it began to rain. They were playing chess when it began to rain. They were playing football when it began to rain. While they were dancing, the telephone rang. When the telephone rang, they were dancing. While they were dancing, what happened? He was singing _______the baby started to cry. _________he was singing, the baby started to cry. when While _________he was walking, a taxi came. He was walking _______ a taxi came. when While 1. He was listening to music ___________ he was riding his bike. 2. I was waiting at the lights ______ I saw the boy fall off his bike. 3. I was walking in the street ______ an accident happened. 4. The driver was talking on his mobile phone ____________ he was driving. while when when while zX.x.K 过去进行时（2） when和while的区别 (一) when，while都有“当……时候”的意思。when既可表示某一点时间，也可以表示某一段时间。 在when引导的时间状语从句中，其谓语动词可以是延续性的，也可以是非延续性的，可与主句中的谓语动词同时发生，也可在其后发生。如： I was just reading a book when she came into my room. 她走进我房间时，我正在看书。 Were you writing when the teacher came in? 老师进来的时候，你在写信吗？ When he was a child, he was always trying out new ideas. 他小时候就常常试验一些新的设想。 [来源:Z|xx|k.Com] (二) while只能表示某一段时间，不能表示某一点时间。在while引导的时间状语从句中，其谓语动词只能是延续性的，而且也只能与主句中的谓语动词同时发生或存在。如： While Jim was mending his bike, Lin Tao came to see him. 正当吉姆修自行车时，林涛来看他。????? You can’t do your homework while you’re watching TV. 你不能一边看电视一边做家庭作业。 (三) when和while的区别还在于: while引导的时间状语从句多用进行时态，而when引导的时间状语从句多用一般时态。如： While they were talking, the bell rang. 他们谈话的时候，上课铃响了。 I was doing my homework when my mother came back home yesterday evening. 昨天晚上妈妈回家的时候，我正在做家庭作。 [链接] as 所表示的动作与主句同时发生，具有延续的含义，一般与延续行动词连用。如： As the doctors were checking him, the pain got worse. 医生给他做检查时，疼痛加剧了。 I was coming in as he was going out. 他进来的时候我正出去。 注 意 (1) 如主句谓语动词表示的是短暂动作，从句时间状语指一