上海市罗泾中学八年级英语上册 Unit 3 Lesson 2 exhibitions and mus

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 reac hed the school gate ________ the bell rang.
A. while
B. when
C. a s
D. as soon as
6. He was ab out 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. bef ore
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 missing.
A. as
B. before
C. since
D. when
It __ long before we ___ the result of the experiment.
A. will not be; will know
B. is; will know
C.will not be ; know
D. is; know –What was the party like? --Wond erful. It’s years __ I enjoyed myself so much.
A. after
B. before
C. when
D. since
14. The new secretary is supposed to report to the manager as soon as she___
A. will arrive
B. arrives
C. is going to arrive
D. is arriving
15. _____ got into the room _____ the telephone rang.
A. He hardly had; then
B. Hardly had he; when
C. He had not; then
D. Not had he; when
16. No sooner had he finished his talk _____ he was surrounded by the workers.
A. as
B. then
C. than
D. when
17. –Did you remember to give Mary the money you owed her?--Yes, I gave it to her _____
I saw her.
A. while
B. the moment
C. suddenly
D. once
18.I thought her nice and honest ___ I met her.
A. first time
B. for the first time
C. the first time
D. by the first time
19. He will have learned English for eight years by the time he _____ from the university next year.
A. will graduate
B. will have graduated
C. graduates
D. is to graduate
20. The moment the 28th Olympic Games _____ open, the whole world cheered.
A. declared
B. have been declared
C. have d ec lared
D. were declared
21 I ___the message to him as soon as he ___back tomorrow.
A give, come B. will give, will come C. will give, comes D. give, wi ll come
22. the doctor advised me to live ____the air is fresh.
A in where B. in which C. the place where D. where
23. The Red Cross is expected to send help _there is human suffering.
A whoever B. however C. whatever D. wherever
24. If you are traveling __the customs are really foreign to your own, please do as the Romans do.
A in which B. what C. when D. where_。