2019新人教选择性必修三Unit2Discover useful structures公开课学案

1 .To master the usage of the infinitive as subject.

2 .To use the relevant grammar flexibly and authentically in real situation. 3 .To understand the difference between the infinitive as subject and v.-ing form as subject.

Part I Observation

Activity 1 Look at the following sentences and pay attention to the italicized infinitives^^ tell their meanings and functions.

1.7b change bad habits is never easy.

2.It took the surgeon three hours to finish my mother fs 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. The infinitive in each sentence functions as .

Summary kmeanings and functions of the infinitive of the verb as the subject.

Activity 2 Find more infinitives in the reading passage.

Part II Self-directed study

Activity 1 Fill in the blanks using the right form of the word,and try to change it into another sentence pattern.

Lit is important Tom to get that job. It is kind you to help me with my homework. 2 .(talk) with him is a great pleasure.一It is . 3 .(help) others is our duty,一. 4 .It took Tom 2 hours.(作准备)

Summary 2:不定式作主语,it作形式主语的常见结构: 例1

It is easy for me to learn how to drive.学开车对我来说很轻松。

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 our duty to take care of you,照顾你是我们的责任。

例3

It takes me half an hour to do my housework.我花了半个小时做家务。

Activity 2 Compare the two sentences below and tell the difference in meaning. 1 .To look after children is her job today.她今天的工作是看孩子。 2 .Looking after children is her work.她的工作是照顾孩子。 Summary 3:不定式作主语和动词工〃g形式作主语和动词的区别：

More examples:

Smoking is prohibited here.这里禁止抽烟。（抽象）

It is not very good for you to smoke so much.你抽这么多烟对你身体很不好。 体）

Climbing mountains is interesting.爬山很有趣。（的事或经验）

（具To finish the task will take a long time.要完成这项任务将要花费很长时间。（未完成的事或目的)

Part III Complete the sentences.

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

Summary 4:

Part IV Analyse the sentence patterns Activity 1 Fill in the blanks.

1.Sometimes it's better (remain) silent.

2 .Although is a hard task to protect the environment,we can't help but go ahead. 3 4

.(control) the air pollution is necessary.

.It was foolish him to endanger his life in that way.

5 .Don't you think it is rude him to ask a lady her age? 6 .It is difficult him to live on such a small salary. Summary 5:

1 .如果要说明不定式表示的动作是谁做的，可以在不定式前加一个由for/of 引起的短语，构成。

2.It is+adj.+for sb to do…(修饰物的形容词)

(^4/.:easy,difficult,comfortable,pleasant Jight,dangerous,tiresome,interesting,hea vy,fit)

It is+adj.+ of sb to do…(修饰人的形容词)

(tz4/.:kind,good,nice,wise,unwise,clever,silly,stupid,foolish,careless,rude,polite,n aughty)

Activity 2 Complete the conversation with the correct forms of the phrases in the box.

begin with be in control of make a choicedecide on make up one's mind

1 .A:Hello,doctor.! 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.Fm 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?! hate likethese.You know

what 一I'm going to eat both!

B:Wow! Don't eat too much junk food一you'll get fat.Fve actually to go on a diet,so ril just stick to the fruit salad.

Activity 3 Complete the sentences using the correct forms of the words. 1 .(lean) out of the window is dangerous. 2 .(save) money now seems impossible. 3 .It is an offence (drop) litter in the street.

4 .It is stupid of you (write) down everything that the teacher says. 5.(say) is one thing and to do is another. 6.It seemed a pity (waste) so much time.

7.1 don9t think (你问是不礼貌的)how long theinterview will last. 8 .(保卫是我们的职责)the country against itsenemies. 9 .(花了我半个小时)to wash the clothes. Part V核心素养专练

1.1 like eating fried tomatoes with eggs,and I thought it must be easy (cook). 2.1t is easy for them (care) for.

3.1t was so good (feel) accepted for what I'm good at.

4.1t,s my first time(hear) Chinese stories told by an English speaker. 5 .Then we will know how important is to have meaning in our life. 6.It is not a simple matter(determine) the nature of talent.

7.(learn) to think critically is an important skill today's children will need for the future.

8.On our way to the house,it was raining so hard that we couldn't help wondering how long it would take (get) there. 参

Part I Activity 1

the subject of the sentence

Summary 1:动词不定式在句中作主语，有时为了保持句子的平衡，防止头重脚轻，常用让作形式主语，而真正的主语放在句子的末尾。比方第2、3、4例句。

Activity 2

1.1 can be easy for some of them to form bad habits. 2.After all,it is not easy to break bad habits. Part II Activity 1 1 .for;of

2 .To talk;a great pleasure to talk with him 3 .To help;It is our duty to help others

4 .to make preparations Summary 2:

例 l:It is +adj.+(ior sb) to do;It is +adj.+(oi sb) to do 彳列 2:It is +n.+ to do sth(an honour,our duty,a pity,a shame) 例 3:It takes/took sb some time to do sth

Summary 3:动词-沅g形式和不定式作主语都是说明一个内容。不定式通常表 示一个将来的、具体的内容;而动词切g形式那么表示一种经常性的、习惯的或抽象 的概念。

Part III

3.1 t is important to avoid passive cigarette smoking.

2.It will take a nutrition specialist an hour to make a balanced diet menu for you. 3.1t is useful to turn to fitness consultant for advice. 4.1t is illegal and dangerous to take drugs. 5.It is harmful to often skip breakfast. Summary 4:

1 .单个不定式作主语，谓语动词单数. 2 .不定式作主语时,可以用it作形式主语. Part IV Activity 1

1 .to remain 2.it 3.To control/Controlling 4.of 5.of 6.for Summary 5:不定式的复合结构 Activity 2

l.be in control of 2.decide on 3.begin with 4.to make choices;made up my mind

Activity 3

l.To lean 2.To save 3.to drop 4.to write 5.To say 6.to have wasted 7.it is impolite of you to ask 8.1t5s our duty to defend 9.It took me half an hour

Part V

l.to cook 2.to be cared 3.to feel 4.to hear 5.it 6.to determine7.Learning 8.to get