2019新人教高中英语选择性必修三Unit2 Healthy Lifestyle
Discover Uful Structures公开课教案
Teaching aims:
1.Enable students to master the usage of the infinitive as the subject.
2.Guide students to u the relevant grammar flexibly and authentically in real situations.
3.Help students to understand the difference between the infinitive as the subject and the v-ing form as the subject.
Teaching key points:
1.Help students identify the usage of the infinitive as the subject.
2.Guide students to u the infinitive as the subject to express their own ideas.
3.Design specific situations for students to make u of the infinitive as the subject.
Teaching difficult points:
How to u the infinitive as the subject in real situations.
Teaching procedures:
StepⅠLead-in
Activity 1 Look at the following ntences and pay attention to the italicized infinitives,and tell their meanings and functions.
1.To change bad habits 带双字的成语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.
The infinitive in each ntence functions as .
Summary 1:meanings and functions of the infinitive of the verb as the subject.
Suggested answer:
Summary 1:动词不定式在句中作主语,有时为了保持句子的平衡,避免头重脚轻,常用it作形式主语,而真正的主语放在句子的末尾。比如第2、3、4例句。
Activity 2 Find more infinitives in the reading passage.
Suggested answers:
1.I can be easy for some of them to form bad habits.
2.After all,it is not easy to break bad habits.
雾霾等级
StepⅡ Self-directed study
Activity 1 Fill in the blanks using the right form of the word,and try to change it into another ntence pattern.
1.It is important Tom to get that job.
It is kind you to help me with my homework.
透亮2. (talk) with him is a great pleasure.→It is .
3. (help) others is our duty.→ .
4.It took Tom 2 hours .(作准备)
Suggested answers:
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: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 古代人物绘画drive.学开车对我来说很轻松。
暇组词
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 houwork.我花了半个小时做家务。
Activity 2 Compare the two ntences 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-ing形式作主语和动词的区别:
Suggested answers:
Summary 3:动词-ing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-ing形式则表示一种经常性的、习惯的或抽象的概念。
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。(具体)
Climbing幼儿园小班评语 mountains is interesting.爬山很有趣。(已知的事或经验)
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)
Step Ⅲ Complete the ntences.
Join the words to make full ntences using the infinitive.
1.important/avoid/passive cigarette smoking.
___________________________________________________________
2.will take/nutrition specialist/a balanced diet menu/make/an hour/for you.
___________________________________________________________
3.uful/turn to/fitness consultant/for advice
___________________________________________________________
4.illegal/dangerous/take/drugs
___________________________________________________________
5.harmful/skip breakfast/often
____________________________________________________________
Suggested answers:
1.It is important to avoid passive cigarette smoking.
2.It will take a nutrition specialist an hour to 消火栓的使用方法make a balanced diet menu for you.
3.It is uful to turn to fitness consultant for advice.
4.It is illegal and dangerous to take drugs.
5.It is harmful to often skip breakfast.
Summary 4:
1亩地是多少平方米
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.
StepⅣ Analy the ntence 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. (control) the air pollution is necessary.
4.It was foolish him to endanger his life in that way.
