牛津译林版（2019）必修 第三册Unit 1 Nature in the balance Grammar and usage 状语从句的省略课件(共18张PPT)

(共18张PPT)
状语从句的省略
在时间、条件和让步等状语从句中, 如果从句主语和主句的主语一致或从句主语是it, 且从句的谓语含有be动词的某种形式, 从句的主语和be动词可以省略, 并且要同时省略。
状语从句的省略
一般说来省略现象多出现在下列五种状语从句中：
1.由when ,while ,as ,before, after, till, until, once等引导的时间状语从句；
2.由whether ,if ,unless 等引导的条件状语从句；
3.由 though ,although ,even if ,whatever等引导的让步状语从句；
4.由 as ,than 等引导的比较状语从句；
5.由as,as if ,as though 等引导的方式状语从句.
状语从句的省略
表示正在进行或主动的动作时，省略后的句式是“连词+doing”。
Be careful when you are crossing the river.
Be careful when crossing the river.
状语从句的省略
表示被动时，省略后的句式是
“连词+done”。
When she was asked what she would do in the future, she made no answer.
When asked what she would do in the future, she made no answer.
状语从句的省略
如果状语从句中有it is时，it is可以同时省略，即“连词+形容词”。
I’d like to take you here this weekend if it is possible.
I’d like to take you here this weekend if possible.
状语从句的省略
While I was at college, I tried to read as many books as possible.
状语从句省略后，保留的是“连词+介词短语”。
While at college, I tried to read as many books as possible.
状语从句的省略
He acts as if he were an expect.
状语从句省略后，保留的是“连词+名词”。
He acts as if an expect.
[熟读深思] 阅读下列句子, 指出划线句中省略的单词
1. The country singers were playing the guitar while singing.
(while 后省略了_________ )
they were
2. When asked to answer questions, you should stand up.
(When 后省略了________ )
3. He will help us do it, if necessary.
(if 后省略了 _____ )
you are
it is
当从句的主语是 it,谓语动词中又含有系动词be 时 ,可以把it和系动词be一起省略.
if necessary/possible/if true/so/not
连词+doing
状语从句的省略
连词+done
连词+to do
连词+介词短语
连词+形容词
连词+名词
以下为约定俗成的省略形式：
if so如果是这样的话
if not如果不是这样，否则
if ever如果曾经有的话
if any如果有的话
if necessary如果有必要的话
if possible如果可能的话
when necessary 在必要的时候
1. When these products were first introduced to the market, they enjoyed great success.
→ When first ___________ to the market, these products
enjoyed great success.
2. When we look at the picture at a distance, we find it more beautiful.
→ When _________ at a distance, we find the picture more beautiful.
3. She hurriedly left the room as if she was angry.
→ She hurriedly left the room as if ________.
句型转换
introduced
angry
looking
[灵活运用]
When _________(travel)in Shanghai, I happened to meet my friend. We chatted for a little while.
Even though ______ (invite), I didn’t have a drink with him because I was in such a hurry.
invited
traveling
完成句子
⑥___________(如果可能的话) ，I will learn to carve.
⑦______________(在必要的时候) ，I will step out of my comfort zone.
⑧ ___________(如果有必要的话)，we will grow some waterlily in the pond，which is located at the backof our house.
If possible
If necessary
When necessary
1.When ____about what she thought of the movie, she just said it was worth seeing a second time.
A. asked B. asking C. being asked D. to be asked
2. In classes, you’d better understand as much as possible while_____ notes.
A. talking B. talk C. taken D. to take
3.Online shopping, when properly_____, can save a lot of time, money and energy.
A. done B. is done C. having done D. doing
4.Though ____of danger, sightseeers have been flocking to the site where the world’s biggest terrorist Binladen lived.
A. warned B. warning C. being warned D. having warned
A
A
A
A
1.When ________ , the museum will open to the public next year . (complete)
2.The flowers his friend gave him will die unless _______every day. (water)
3. When _______what they needed most, the kids said they wanted to feel important and loved. ( ask)
4.One day while ________(work) at the cash register in the gift shop,I saw an elderly couple.
completed
watered
asked
working
5.When_______(finish),the knot looks identical from both the front and back.
6.They promise to take action,_____needed, to maintain financial stability in the euro area as a whole.
7.The building was still shaking while I_______(walk) along the road.
8.Friendship is like money: easier made than _____ .(keep)
finished
if
walking
kept