资源简介

(共19张PPT)
UNIT 2 HEALTHY LIFESTYLE
Discovering Useful Structures
Read and Observe
Pay attention to the red italicized infinitives and discuss the meanings and functions of the italicised infinitives.
1. To change bad habits is never easy.
2. It took the surgeon three hours to finish my mother’s lung surgery.
3.To join the People’s Liberation Army, it is required for men to shave off their beards.
4. It was not polite to disturb your neighbors with loud music last night.
主语
主语
主语
主语
动词不定式（短语）作主语
位置
直接放在________作主语；
为了保持句子平衡，用________作形式主语，放在句首，把真正的主语 — 动词不定式置于句后；
句首
it
Observe
To see is to believe.
To get good grades requires a lot of hard work.
To learn a skill is very important for everyone in society
1.不定式作主语通常位于______，表示具体的某一次动作，谓语动词用______。
句首
单数
用法
（2）两个或两个以上动词不定式并列作主语，若语意不一致则用
复数；但如果动词不定式作为一个整体或属于同一概念，仍
用单数。
To improve people’s lives and to speed up socialist
construction are our two important tasks today.
提高人民生活水平和加快社会主义建设是我们当前的两个重
要任务。
Early to go to bed and early to rise makes a man healthy.
早睡早起有益健康。
2. 当主语较长，谓语较短时，常用it作形式主语放在句首，而将真正的主语—不定式放到谓语的后面。
It is not right for people with the virus to go to public places.
It was not polite to disturb your neighbours with loud music last night.
To join the People’s LiberationArmy , it is a rule for men to shave off their beards.
It took the surgeon three hours to finish my mother’s lung surgery.
常用句型1：It is+adj.+for/of sb +to do sth
若adj. “描述人的品格、特点”, 用of,如 kind, nice, wise, silly, polite, impolite, friendly, foolish, clever;
若adj.“描述事或行为的特征”, 用for,如easy, hard, difficult, possible, important, impossible, necessary,good,
bad, exciting, interesting, surprising
It’s difficult for me to get up.
It’s very kind of you to help me.
Summary
例1. It is +adj.+(for sb) to do
eg: It is easy for me to learn how to drive.学开车对我来说很轻松。
It is +adj.+(of sb) to do
eg:It is clever of you to apply for the position. 你申请这个职位真是明智的。
例2. It is +n.+ to do sth( an honour, our duty, a pity, a shame)
eg:It is our duty to take care of you. 照顾你是我们的责任。
例3. It takes/took sb some time to do sth.
It takes me half an hour to do my housework. 我花了半个小时做家务。
不定式作主语，it 做形式主语的常见结构：
名师点津
在It is＋no use/no good/useless/a waste of time ...句型中常用动词-ing
形式作真正的主语。
It is no use waiting here doing nothing.
无所事事地在这里等待是没有用的。
3.动词不定式与疑问词who, whom, whose, what, which, when, where, how连用构成不定式短语做主语。
How to use the computer is the question.
如何使用计算机是个问题。
Where to go has not been decided.
去哪儿还没有定下来。
To look after children is her job today.
她今天的工作是看孩子。
Looking after children is her work.
她的工作是照顾孩子。
Compare the two sentences below and tell the difference in meaning.
Summary不定式作主语和动词-ing形式作主语的区别：
5. 动名词作主语表示_______________的行为;不定式作主语表示 _________________________ 动作。
经常性或习惯性
具体的、一次性的或将来的
1. ______ (do) morning exercises regularly is good for your health.
2. It feels really good ______ (do) morning exercises today.
Doing
to do
【即时演练1】　完成句子
① an opportunity to attend the
interview today.
我很荣幸有机会参加今天的面试。
② their country is the highest honour for
most athletes.
被选中代表他们的国家是大多数运动员的最高荣誉。
③ is hard work but to go down the mountain is
great fun.
上山很艰难，下山却很好玩。
It is a great honour for me to have　
To be chosen to represent　
To climb the mountain　
④ new words by seeing them
repeatedly.
对我们来说，通过反复看来记新单词是一个不错的方式。
⑤ this kind of rare and precious animal remains a great
concern.
如何拯救这种稀有珍贵的动物仍然是一个很大的问题。
It is a good way for us to memorize　
How to save　
【即时演练2】　完成句子
① awareness of environmental protection
and develop the good habit of garbage sorting.
我们有必要提高环保意识，养成垃圾分类的好习惯。
② new cultures and meet
new friends.
这是一个接触新文化和认识新朋友的好机会。
③ the global warming.
控制全球变暖需要多年的工作。
It is necessary for us to raise　
It is a good chance to come into contact with　
It takes years of work to control　
④ using disposable chopsticks to protect forests.
停止使用一次性筷子对于保护森林至关重要。
⑤ nervous at first when making a speech in
public.
当你在公众场合演讲时，一开始感到紧张是正常的。
It is vital to stop　
It is normal for you to feel　
Join the words to make full sentences using the infinitive.
1. important/avoid/passive cigarette smoking.
____________________________________________________________
2. will take/nutrition specialist/a balanced diet menu/make /an hour/for you.
_____________________________________________________________
3.useful/turn to/fitness consultant/for advice
_____________________________________________________________
4.illegal /dangerous/take /drugs
_____________________________________________________________
5.harmful/skip breakfast/often
________________________________________________________________
It is important to avoid passive cigarette smoking.
It will take a nutrition specialist an hour for you to make a balanced diet menu.
It is useful to turn to fitness consultant for advice.
It is illegal and dangerous to take drugs.
It is harmful to often skip breakfast.
1.单个不定式作主语，谓语动词 ________
2. 不定式作主语时,可以用 it 作__________.
单数.
形式主语
Summary 4
Step III Complete the sentences.
P17
1. A: Hello, doctor. I want to lose weight, but I just can 't seem to do it. What can you do to help me
B : Well, first, it's necessary to ______________ what you eat. Cut out all fatty food and sugary drinks, and eat more fruit and vegetables.
2.A: I really need to ________a way to exercise more. I could use a fitness app, but my phone's full.
B: So delete a few files. I'm sure the app doesn't take up much space.
3 A: Before exercising, always do a few warm-ups to___________________.
B:I know. But then I always feel too tired to continue!
4. A: Should I go for the pizza or the fried chicken I hate _____________ like these. You know what —I'm going to eat both!
B: Wow！Don't eat too much junk food-you'll get fat. I've actually ________________ to
go on a diet, so I'll just stick to the fruit salad.
be in control of
decide on
begin with
to make choices
Complete the conversation with the correct forms of the phrases in the box .
made up my mind
begin with be in control of make a choice decide on make up one’s mind
to do
to do 作主语位于句首，在谓语之前
to do 作主语位于谓语之后，It作形式主语
疑问词+to do 构成不定式短语，作主语
和-ing 作主语的区别
To read without reflecting is like eating without digesting.
It takes sb. time/money to do sth.
It is + adj. + （for/of sb.） to do sth.
It is + n. + (for sb.) to do sth.
to do 表示具体的，将来的动作
-ing 表示一般的，已经完成的动作
与疑问词who, whom, whose, what, which, when, where, how等连用
Summary
THANKS
by Miss Xiang

展开更多......

收起↑