仁爱版英语八年级下册全册语法复习.pptVIP

时间状语从句When/while/before/after/until/as soon as+一个完整的句子构成“时间状语从句” 注意几点： 一、 when/while 的区别 1.when表示主从句两个动作同时发生或先后发生。而while表示主从句两个动作同时发生或强调主句的动作在从句动作进行期间发生。 (1)______ they are waiting for the New Year, they listen to music , sing songs and dance. (2)______ the boy saw his mother, he stopped crying. 2. when+短暂性动词或延续性动词 while+延续性动词 (1)He was doing his homework ______ I saw him. (2)________she was singing, we all lost ourselves in her beautiful voice. (3)She was cooking _______ someone knocked at the door. 3.进行时+while+进行时 She was dancing _________ I was singing 五、 …until… “直到” …not…until…直到……才…… 如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。 He waited until it was 12 o’clock. He didn’t go home until it was 12 o’clock. I worked until he came back. 我工作到他回来为止。 I didnt work until he came back. 他回来我这才开始工作。 六、as soon as as soon as...可译为一……就……，用来表示主从句的动作是紧接着发生的。 eg. He will come and see you as soon as he can. 他一有空就来看你。 He rushed home as soon as he got the good news. 他一得到这个好消息就奔回家。 有些副词的比较等级变化是不规则的。常见的有： * While When when When/while when while 二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生。 1．从句动作在主句动作前发生，只用 when。 ①When he had finished his homework，he went to bed at once． （finished先发生） ②When I arrived at the airport，the guests had left． (客人) （arrived at 后发生） 2. when从句动词为瞬间动词时，不能由while替换。如： When he came yesterday, we were playing basketball. 昨天他来时，我们正在打篮球。 三、as引导的时间状语从句表示“当……时”“一边……一边……”，指主句的动作和从句的动作同时发生，既可以表示一段时间也可以表示一点时间。 ① As the time went on，the weather got worse． 随着时间的推移，天气变得越来越糟糕 ② He jumps as he goes along. 他边走边跳。 ③The little girls sang as they went． 小姑娘们一边走，一边唱。 四、before引导的时间状语从句表示表示的动作发生在主句动作之后。 My father booked the room before we arrives. He worked in Hangzhou before he came here. after引导的时间状语从句所表示的动作发生在主句动作之后 After they parked their bikes, they went to Tianan men square. I will call you after I finish the work. If 引导的条件状语从句Revision_selfcheck