U2 Healthy lifestyle to do 作主语 选择性必修三 课件

(共22张PPT)
（人教版）选择性必修三U2
Period 3 Discouver useful structures
Healthy lifestyle
Unit2
Learning objectives
By the end of the lesson, I will be able to...
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Master the three common forms of the infinitive (to do) as the subject.
Tell apart the sentence patterns with it as the formal subject for to do.
Use wh-word + to do phrases correctly as the subject in sentences.
Apply the to do as subject in exercises and simple conversations.
A brief review：complete the sentence
The duty of the soldiers is ___________(defend) their country.
Several problems remain _____________(settle).
The question is how _____________(carry) out the plan.
All he wants is _________(buy) a bicycle.
to defend
to be settled
to carry
to buy
to do 作表语
What about the following ones
What’s the functions of “to do” in the sentences
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 neighbours with loud music last night.
主语
主语
目的状语
主语
主语
动词不定式作主语常见的三种形式
1. 不定式作主语通常位于句首，表示具体的某次动作.
To see is to believe.
To get up early is necessary.
To work out the problem is not easy.
=It’s not easy to work out the problem.
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。
动词不定式作主语常见的三种形式
It is necessary for you to change your job.
It’s very kind of you to say so.
It must be great fun to fly to the moon in a spaceship.
It will take us a lot of money to buy that house.
It is + adj. + for sb. to do sth. (adj.修饰物)
It is + adj. + of sb. to do sth. (adj.修饰人)
It is + n. + (for sb.) to do sth.（pity/shame/fun/joy/pleasure...）
It takes/took/will take sb. some time/money to do sth.
it作形式主语代替真正主语不定式常见于以下情况中：
3. 动词不定式与疑问词who, whom, whose, what, which, when, where, how等连用构成不定式短语，也可作主语。
How to use the computer is the question.
Where to go ________(have) not been decided.
Where and when to go on a holiday ________(have) not been decided.
如何开始比到哪里停止还困难。
_____ _____ _____ is more difficult than _____ ______ ______.
动词不定式作主语常见的三种形式
has
has
How to start
where to stop
基础填空题用所给词的适当形式填空 （穿插分词）1. _______________ (learn) a foreign language requires patience.2. It is important ____________ (keep) calm in an emergency.3. ____________ (swim) in the lake is dangerous.4. How ____________ (improve) my writing skills is my biggest concern.5. It took her three hours ____________ (prepare) for the party.To learn/Learningto keepSwimmingto improveto prepare基础填空题用所给词的适当形式填空 （穿插分词）6. ____________ (not give) up is the key to success.7. What ____________ (do) next is still under discussion.8. ____________ (read) aloud every morning helps with pronunciation.9. It is necessary ____________ (obey) the school rules.10. ____________ (wait) for others makes me angry.Not to giveto doReadingto obeyWaiting提升填空题用所给词的适当形式填空 （穿插分词）1. ____________ (master) a skill takes time and effort.2. It is no use ____________ (cry) over spilt milk.3. How ____________ (balance) work and life is a common problem.4. It is kind of you ____________ (help) the elderly.5. ____________ (win) the competition requires hard training.MasteringcryingTo winto helpto balance提升填空题用所给词的适当形式填空 （穿插分词）6. ____________ (watch) too much TV is bad for eyes.7. What ____________ (choose) is a difficult decision.8. It is impossible ____________ (finish) the work in one day.9. ____________ (not attend) the meeting will make the boss angry.10. ____________ (run) every morning is good for health.RunningNot to attendto finishto chooseWatching翻译题1. 学好数学对我们来说很重要。 It is important for us to learn math well.2. 如何解决这个问题还没有确定。How to solve this problem hasn't been decided yet.3.放弃不是一个好选择。To give up is not a good choice.4. 每天锻炼有助于保持健康。 Exercising every day helps keep healthy.5. 按时完成作业是学生的责任。It is the students' duty to finish homework on time.1. [2019·全国I卷] It is difficult _____________ (figure) out a global population of polar bears.
2. [2019·天津卷改编] Then we will know how important it is _____________ us to have meaning in our life.
3. [2019·天津3月卷] Coming out of this experience, I realize it is OK ________ (be) different from others.
4. [2018·全国Ⅱ卷] Exercise energizes you, so ________
is more difficult to relax and have a peaceful sleep when you are very excited.
to figure
for
to be
it
Join the words to make full sentences, and then join the sentences to make a paragraph. You can add your own sentences if necessary to make your paragraph more meaningful.
1. important / avoid / passive cigarette smoking
It is important to avoid passive cigarette smoking.
n. 香烟
2. will take / nutrition specialist / a balanced diet menu / make / an hour / for you
It will take the nutrition specialist an hour to
make a balanced diet for you.
3. useful / turn to / fitness consultant / for advice
It is useful to turn to the fitness consultant for
advice.
n. 专家
n. 顾问
4. illegal / dangerous / take drugs
5. harmful / skip breakfast / often
It is illegal and dangerous to take drugs.
It is harmful to skip breakfast often.
n. 毒品，药品
v. 跳过
Complete the conversations with the correct forms of the phrases in the box.
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.
be in control of
begin with, be in control of, make a choice, decide on, make up one’s mind
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!
decide on
begin with
begin with, be in control of, make a choice, decide on, make up one’s mind
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.
making choices
made up my mind
begin with, be in control of, make a choice, decide on, make up one’s mind
Make up two conversations according to Activity 3.