外研版（2019）选择性必修第二册Unit 5 A Delicate World Grammar 课件(共20张PPT)

(共20张PPT)
Unit 5
Using language
- Grammar
A delicate world
No visitor would think it surprising that
b. No visitor would think that the island being a UNESCO World Heritage Site is surprising.
Experts felt it necessary
Experts felt to come up with a plan to remove all the rabbits from the island was necessary.
group 2:
What does “it” refer to in sentences (a) and (c)
2. What is the difference between the sentences in each group
the island is a UNESCO World Heritage Site.
to come up with a plan to remove all the rabbits from the island.
When the object of a sentence is a that-clause (b) or an infinitive (d), we sometimes use “it” as an empty object and put the real object later to keep balance.
Observe and say
P53 1
『
』
group 1:
Now look for more sentences with this structure in the reading passage, and summarise its use in your own words.
Have A L k
1. This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all.
2. This intervention is a long, much-delayed ending to a sad story, but we humans owe it to the island to give it a happy ending.
1. This incident made ________ clear that the rat, mouse and rabbit problem needed solving once and for all.
2. This intervention is a long, much-delayed ending to a sad story, but we humans owe ______to the island to give it a happy ending.
it
it
Focus on
基本概念
用法及常见情况
特殊情况
It as an empty object
It作形式宾语
it作形式宾语用法及常见情况归纳
(1) I find it quite necessary to make some changes.
我觉得做些改变十分必要。
(2) 1 think it wrong doing it this way.
我认为这样做是错误的。
(3) We have made it clear that she has nothing to do with the case.
我们已经说的很清楚，她与这个案子无关。
当不定式、动名词或从句在某个句子中作宾语时，为了保持句子的结构平衡，常用it作为形式宾语，而将真正的宾语放到句子后部去。
it代表不定式
it代表动名词
it代表连接代词或副词引导的从句
it作形式宾语的几种特殊情况
1. 动词 + it + that从句，常见于take, have, put等动词之后。
I take it that he will finish the task by himself.
我认为他能自己完成这项任务。
2. 动词 + it + when / if从句，常见于appreciate, enjoy, like, prefer等动词之后。
We really appreciate it if you could do us a favour.
如果您能帮助我们，我们会很感激。
He made it known to everyone that he was right.
他让每个人都明白他是对的。
3. 动词 + it + 介词短语 + that从句，常见于owe it to sb, take it for granted等结构中。
We owe it to you that we are still alive.
多亏有你，我们还活着。
5. 动词 + it + V-ed + 从句
4. 动词 + 介词+ it + that从句，常见于look to, depend on, insist on, stick to, answer for等结构中。
She insisted on it that she was innocent.
她坚持说自己是无辜的。
many people think it a good idea to keep this turtle as a pet
believe it no big issue to release them into the wild
people have found it a threat to other species to release these turtles into the wild
Experts consider it important for owners to keep their pets in an enclosed area
Rewrite the underlined parts using it as an empty object.
P70
Check your answers:
2
Look at the pictures of the Saihanba National Forest Park and describe its changes using it as an empty object where appropriate.
1960s
Present day
P71
3
Possible answer: I think it a breakthrough to transform a desert into a forest. In the 1960s, Saihanba was a desert, which made it impossible to grow plants. Besides, I feel it unrealistic to plant trees without water. But in fact, some workers investigated it and found it likely to grow crops and plant trees. Then, they felt it their duty to recreate the forest of Saihanba. As a result, Saihanba has become a beautiful forest park.
Describe how a place you know has changed using it as an empty object where appropriate.
P71
4
1. They discovered that the upper and lower front teeth of ancient human adults were aligned (对齐), making _____ hard ____________ (produce) labiodentals(唇齿音), which are formed by touching the lower lip to the upper teeth. Later, our jaws changed to an overbite structure, making ______ easier ____________ (produce) such sounds.
(2022新高考I卷阅读理解D)
2. That was why none of the children thought ______ unusual ______ David had decided to join the cross-country team. (2022新高考I卷读后续写)
直击高考
it
it
to produce
to produce
it
that
3. Generation Xers with young families, like my wife and I, can still find _______ convenient ________ (have) a home phone rather than providing a mobile phone for every family member.
(2021全国乙卷阅读理解B)
4. The engineers at the Massachusetts Institute of Technology(MIT) have taken ____ a step further __________ (change) the actual composition of plants in order to get them to perform diverse, even unusual functions. (2020全国卷I阅读理解D)
5. Another habit I formed early was being outdoors. My parents made ______ a point for their two kids __________ (spend) time outside, no matter the weather or season. (2020浙江卷七选五)
直击高考
it
it
to spend
changing
it
to have
it作形式宾语
用法及
常见情况
当不定式、动名词或从句在某个句子中作宾语时，为了保持句子的结构平衡，常用it作为形式宾语，而将真正的宾语放到句子后部去。
特殊情况
动词 + it + that从句，常见于take, have, put等动词之后。
动词 + it + when / if从句，常见于appreciate, enjoy, like, prefer等动词之后。
动词 + it + 介词短语 + that从句，常见于owe it to sb, take it for granted等结构中。
动词 + it + V-ed+ 从句
动词 + 介词+ it + that从句, look to, depend on,
insist on, stick to, answer for等结构中。
I. 选词填空。
1. She thought it no good ___________ (to worry/ worrying) about him.
2. I think it necessary for you ________ (to tell/telling) the truth to the boss.
3. The public may find it surprising _________ (whether/ that) the 7-year-old girl can speak more than 3 languages.
4. They found it pleasant ________ (that/why) they had worked with those scientists from China.
5. I hate it __________ (why/when) someone comes in without knocking at the door.
worrying
to tell
that
that
when
II. 用适当的内容或括号中所给单词的适当形式填空。
1. They felt _________ difficult to finish the work in such a short time.
2. I’d prefer it _______ I didn’t have to do so much work.
3. Some people may think _______ a waste of money repairing the ancient building.
4. They have made it a rule ______________ (not smoke) in the room.
5. We all consider it important _________ (put) theory into practice.
it
not to smoke
if
it
to put
III. 用适当的内容或括号中所给单词的适当形式完成短文。
Some students may take it for granted that their parents should send them to school, so they think 1. _______ unnecessary for them 2. ________ (thank) their parents for what they have done. In fact, their thought is wrong. In my opinion, our parents’ hard work and efforts make 3. ______ possible for us to get a good education and live a happy life. Every student should believe 4. ____ very important to study hard. They also should realize it is a waste of time and money 5. ________ (play) video games and focus all their attention on their studies.
it
to thank
it
playing
it
Self-evaluation
1. Can you identify it as an empty object
2. Can you analyse it as an empty object
3. Can you write sentences using it as an empty object correctly
各个击破
Finish the exercises .