Unit 6 时间状语从句讲练结合 2023-2024学年人教版八年级英语下册

时间状语从句 知识提炼 一、引导词辨析 1. when vs. while “当…时” 1)when +短暂性动词/延续性动词 Eg: He was sleeping when she came in. 常见的短暂性动词: ring, wake up, open, get up, leave, come, knock, close, start/begin 2)while+延续性动词(表示动作同时进行,一般用while) Eg: They were doing some cleaning while we were doing our homework. 注:只用when情况:短暂性动词 只用while 情况:主从句动作同时发生的 2. before 在…之前 vs. after 在…之后 Eg: Think it over before making an important decision. =Think it over before you make an important decision. 注:before/after+完整句子/V-ing 3. as soon as 一….就 He took out his phone as soon as the was over . 4. until 直到 vs not…until 直到…才 Eg: I waited until seven o’clock, but he didn’t come. I didn’t leave until he came. 二、时间状语从句中时态问题。(引导词之后为从句) 1. 主将从现(主句:一般将来时或表示愿望 从句:一般现在时) I will call you as soon as I get there. 2. 主祈从现 (主句:祈使句或有情态动词 从句:一般现在时) Please wait until the traffic light turns green. 3. 主情从现 You should turn off the light when you leave the room. 4. 主过从过 (主:过去时 从句: 过去时) He took out his phone as soon as the class was over. 小牛试刀 1. —Mum, when can we go to watch the volleyball match in the sports center? —Not until the homework_ tomorrow. A. will be finished B. is finished C. was finished D. has finished 2. —Can you tell me when you are going to arrive there? —I'm not sure. But I'll ring you up as soon as I_ there tomorrow. A. arrive B. arrived C. will arrive D. am going to arrive 3. Time waits for no man. But some people won't realize the importance of time_ it's gone. A. until B. as C. when D. since 4. —When will the meeting end? —_. A. Not until the agreement is reached. B. Until the agreement is reached C. Not till the agreement is reached. D. Till the agreement is reached. 5. —May I borrow another two books, Madam? —Sorry. No more books can be borrowed until these two_. A. return B. are returned C. will return D. will be returned 6.—Hey, Tony, _ will the competition start? I can't wait to watch. —_ the famous scientist arrives here. A. When; Not until B. When; Until C. How long; Until D. How long; Not until 7. —Beca