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(共16张PPT)
Grammar
Review of
adverbial clauses of time
①He entered the room__________the meeting was going on.
② _______she comes, I shall tell her to wait for you.
③They arrived ____________ we were having dinner.
④______Tony spoke aggressively, Mary listened patiently.
⑤____ time passes, the trade war is becoming worse.
1.when／while／as的用法:
while/when/as
while/when/as
When
While
As
（随着）
（一段时间，延续）
（指时间点，非延续，不能用while）
（一段时间，延续）
（同时发生，对比）
Point1: 用　法
when 从句谓语用延续性动词和非延续性动词均可，主、从句谓语表示的动作可同时或先后发生
while 从句谓语用延续性动词
表示两个延续性动作同时发生且具有对比意味，常与进行时连用
as 强调主、从句动作同时发生
表示“随着”之意
①He was about to leave when someone knocked at the door.
______________________________________________
②Mary was speaking when Tony broke in impolitely!
______________________________________________
③We had just finished the Party on the school playground when it began to rain heavily.
______________________________________________
be about to do…
be on the point of doing... when…
be doing…
had (just) done...
他刚要走忽然有人敲门
Mary在发言时Tony突然插话！
我们在学校操场上的活动刚结束突然就下起了大雨
2.before, since引导时间状语从句的用法:
①We must leave our dormitory before the dormitory teachers close the gate at 7:15
在寝室老师在7点15分关门前，我们必须离开寝室。
②Tony broke in before Mary could finish her words.
Mary还来不及说完Tony就插嘴了。
③Study English hard before it is too late!
趁还不是太晚，努力学习英语吧。
④Cath hasn’t phoned since she went to Berlin.
Cath自从去了柏林还没有打来过电话。
Point2：
before的基本意思是“在…之前”但可灵活翻译为 “还来不及…就…”，“趁…时”； since则表示“从…以后；自…以来”
1. Pessimistically, it will be a long time before China makes a trade deal with America.
2. Optimistically, it won't be a long time before China makes a trade deal with America.
3. It wasn't long before he left the country.
4. It was some time before I realized the truth.
5. It is/has been many years since the trade problem arose between China and America.
It will be +段时间+before.. 要过...才...
It won‘t be +段时间+before… 过不了..就..
It is/was+时间段+before… 过了...才..
It is/was not +时间段+before… 没过多久就...
It is/has been +时间段+since… 自从…有多久了
3.一些表示时间的名词词组和个别介词短语也可以引导时间状语从句，这时它们担当着引导词的功能。
①The moment the debate began, the world’s attention was drawn to the trade war between China and America.
辩论一开始全世界的注意力都被吸引到中美贸易战上。
②The instant Mary began to speak, we could see she is well-educated.
Mary一开口说话我们就看的出她接收过良好教育。
③Each/Every time Tony spoke, Mary listened attentively and respectfully.
每次Tony发言时，Mary都尊重地聆听。
④The first time the negotiation was held, the Chinese Government knew it was a lasting war.
第一次协商开始的时候，中国政府就知道这将是一场持久战。
⑤By the time the TV debate was held, the trade war actually had begun!
到电视辩论的举行时，贸易战其实已经开始了。
Point3:
引导时间状语从句的名词词组和个别介词短语常常有：
the moment/second/minute/instant…
each time, every time, (the) next time,
the first/second/…/last time, by the time...
4.表示“一…就…，刚......就......”的时间状语从句引导词
①The minute the debate began, the world's attention was drawn to the trade war between China and America.
辩论一开始全世界的注意力都被吸引到中美贸易战上。
②The second Mary began to speak, we could see she is well-educated.
Mary一开口说话我们就看的出她接收过良好教育。
③As soon as the trade war begins, the economies of both China and American will be definitely affected.
贸易战一开始，中美经济一定都会被影响。
④Immediately/Instantly/Directly per capita GDP is considered, China is still a developing country.
当人均JDP一被考虑，中国仍然还是一个发展中国家。
⑤Hardly had Mary finished her words when Tony asked another question.
Mary刚刚讲完Tony就问了另一个问题。
⑥No sooner had Tony invited her to have a TV Debate than Mary accepted her challenge.
Tony一发出电视辩论的邀请，Maty就接受了挑战。
Point4: 表示“一…就…”的时间状语从句引导词
As soon as…
Immediately/instantly/directly…
The moment/minute/second/instant…
Hardly/scarcely…when/before…
no sooner…than…
On their arrival/arriving, they began to debate.
介词短On/upon+n/doing也可以做时间状语表示
“一…就…，刚......就......”。
5.其他时间状语从句常用引导词.
①Since Trump became the president, the tariffs have been used as weapons to attack the economies of other countries.
②Mary always waited politely until Tony finished her words. In other words, Mary didn’t begin to speak until Tony finished.
③It was not until Tony finished that Mary began to speak.
④Not until Tony finished did Mary begin to speak.
⑤It is certain that China will be more powerful and prosperous after we defeat America in the trade war.
since(自从......)从句常常为过去式，主句为现在完成时
until/till…(一直到......)主句谓语动词常常为延续性
not…until(直到.......才......)主句谓语动词常常为非延续性
after...(在......后）
Practice:
1. You will grow wiser _________you grow older.
2. I was about to go to bed______________ the telephone rang.
3. I have heard a lot of good things about you_____________ I came back from abroad.
4. It’s much easier to make friends __________________ you have similar interests.
5. He met many problems________________ he was going over his lessons.
as
when
since
when
while
Practice:
6.John thinks it won’t be long _______________he is ready for his new job
7As is reported, it is 100 years_____________ Qinghua University was founded.
8.Time passed quickly and the winter holidays had gone by ___________ we knew it.
9._________________ we met, we were at a party.
第一次见面时，我们在参加一个聚会。
before
since
before
The first time
Practice:
10.I found myself in an entirely new world as soon as I arrived in Beijing.
①→I found myself in an entirely new world __________________________I arrived in Beijing.
②→I found myself in an entirely new world ________________________ I arrived in Beijing.
③→__________ had I arrived in Beijing ________ I found myself in an entirely new world.
④→_____________ had I arrived in Beijing _______I found myself in an entirely new world.
immediately/instantly/directly
the moment/instant/minute
No sooner
than
Hardly/Scarcely
when
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