(重庆)2015年八年级英语教案：Unit 3 Lesson 2《exhibitions and museum》时间状语从句.docVIP

Unit 3 Lesson 2 exhibitions and museum 时间状语从句 教学目标： Teaching objectives: 1. Students will be able to master the adverbial clause of time. 时间状语从句 引导时间状语从句的词有 when, while, as, before, after, until/till , as soon as, since 时间状语从句的时态：when, after, before, until, as soon as引导的时间状语从句，如果主句是一般将来时、祈使句或含有将来的意味，从句用一般现在时代替一般将来时 　　 when“当……的时候”，引导的时间状语从句的动作和主句的动作可以是同时发生，也可以先后发生；从句可以用延续性动词，也可以用点动词。 as“当……的时候”，强调主句与从句中的谓语动词动作同时发生，也可表示一个人的两个动作交替或同时进行，意为“一边……，一边……”，既可指时间点，也可指时间段； while“当……的时候”，也强调主句和从句的动作同时发生；但while只能表示一段时间，从句须用延续性动词。 注：while也可以作并列连词，表转折的关系，相当于but，译为“然而”。 eg.I like listening to music, while my brother likes doing sports. till和until都表示“直到……为止”，主句用延续性动词，主句和从句都用肯定式；表示“直到……才”时，主句用终止性动词，主句用否定式，从句用肯定式。until较till正式，until引导的时间从句可以放在句首。 since引导的时间状语从句常用一般过去时，其主句一般使用现在完成时。． 注：常用句型：It is +时间段+since从句 译为：自从……有多长时间了。 eg.It is six years since she graduated from the university. before 意为“在…之前”，引导时间状语从句时，表示主句的动作发生在从句的动作之前。 after 意为“在……之后”，引导时间状语从句时，表示主句的动作发生在从句的动作之后。 as soon as 意为“一……就……”，表示从句的动作一发生，主句的动作马上就发生。 Exercise： 1. It was quiet ________ those big trucks started coming through the town. A. before B. after C. until D. unless? 2. It seemed only seconds ________ the boy finished washing his face. A. when B. before C. after D. even if 3. Hardly had he reached the school gate ________ the bell rang. A. while B. when C. as D. as soon as? 6. He was about to go to bed ________ the doorbell rang. A. while B. as C. before D. when 7.________I listen to your advice, I get into trouble. A. Every time B. When C. While D. Until 8. _____ John was watching TV, his wife was cooking. A. As B. As soon as C. While D. Till 9. The children ran away from the orchard(果园) ______they saw the guard.A. the moment B. after C. before D. as 10. No sooner had I arrived home _____ it began to rain. A. when B. while C. as D. than 11. Several weeks had gone by _____ I realized the painting was