牛津译林版英语九年级上册第四单元grammar.pptVIP

Sentences: 1.It started to rain when we were at the park. 2.The telephone rang while the girl was doing her homework. 3.Don’t forget to turn off all the lights before you leave the house. 4.I will not start to cook dinner until you come back from work. 5.All the boys rushed out of the classroom as soon as the bell rang. 指在复合句中充当时间状语的句 To learn to use the following conjunctions to introduce time clauses: using before, after, when and while using since, till and until using as soon as and whenever Study aims: 时间状语从句是  一、before, after, when and while 引导的时间状语从句 When the weather is good, my grandpa likes going fishing. 当天气好的时候，我爷爷喜欢去钓鱼。 The sun came out after the storm stopped. 暴风雨停止后，太阳出来了。 注意： 我们可以用before, after, when和while引导时间状语从句，这些词既可放在句首，也可放在句中。 before的意思是“在……之前”，表示主句动作发生在从句动作之前。如： Close the windows before you leave the room, please. 在你离开房间前，请关上窗。 after意思是“在……之后”，表示主句的动作发生在从句的动作之后。如： I went to school after I finished my breakfast. 我吃完早饭去上学。 when意思是“当……时”，表示主句动作发生的特定时间。如： While my sister was sweeping the floor, I was washing the dishes. 我姐姐扫地时，我在洗碗。 while意思是“当……时”，强调主句动作和从句动作是同时发生的。如： The days get longer when spring comes. 春天到来时，白天变长了。 注意：while引导的从句的谓语动词必须是延续性的。 while还可以表示“在……期间”，表示主句动作发生在从句动作进行的过程中。如: While the boys were playing football, it rained. 当男孩子们踢足球时，下雨了。 注意： 在when和while引导的从句中，当主句和从句的主语一致，并且从句中有be动词时，可以省略主语和be动词，构成when/while+ -ing结构。如： When (she is) in trouble, she always asks for my help. 她遇到困难时总是向我求助。 While (I am) travelling, I like to buy some souvenirs. 旅游时我喜欢买纪念品。 David is writing in his diary about one of his days. Help him combine his sentences using before, after, when or while. (P54) A 1. I go to jogging every morning. Then I have breakfast. _____________________________________ ________________________________ 2. I practised playing basketball for hours. I felt tired out. _____________________________________ _________________________________ I go jogging every morning before I have breakfast. After I practise