人教版(新教材)高中英语选修3Unit2 Healthy Lifestyle精品学案：Grammar-不定式作主语

1、Grammar不定式作主语单元语法-一图贯通思维导图单元语法-一图贯通吾法整体突破语境理解 合作探究 IIIIIIIIIIIIIIIIIIIIIIIK合作探究阅读以下句子，体会动词不定式的用法。To see is to believe.百闻不如一见。It is interesting to play with snow in winter.冬季里玩雪是很有趣的。Ifs important for human beings to keep the balance of nature.保持自然平衡对人类来说很重要。K自主发现R不定式是非谓语动词的一种，没有人称和数的变化,在句中可以作主语（有名词

2、和代词的作用），通常表示具体的、特定的行为。一、用法不定式位于句首To study English well is not easy.学好英语不容易。it作形式主语，把不定式（短语）置于句末。为了防止头重脚轻，可用it作形式主语，把不定式（真正主语）放到句子后面。It would be a great honor for me to invite you to come to China.邀请你来中国对我来说是一件非常荣幸的事。As we all know, it is good for your health to stop smoking.众所周知，戒烟益于健康。二、 动名词和不定式作主语

3、的区别一般来说，不定式作主语表示一次性的、具体的动作，而动名词作主语表示一种 抽象的和泛指的动作。To lie is wrong.说谎是错误的。(对于说谎者是谁，说话人心中是有所指的)Swimming is good exercise.游泳是一项很好的锻炼。(指游泳这项运动)K巩固内化补全句子It takes about ten minutes to walk to the bank.步行去银行大约用十分钟时间。Its important for you to learn foreign languages well.对你们来说学好外语非常重要。(3)It9s very kind of you

4、 to say so.你这样说真是太好了。It must be great fun to fly to the moon n a spaceship.乘宇宙飞船飞往月球一定很有趣。When to hold the pieeting hasnt been decided yet.什么时候开会还没有定下来呢。(名师提醒不定式与疑问词how, what, when, where, which等连用构成不定式短语，也可作 主语。How to use the computer is a question.如何使用计算机是个问题。 课堂实践应用步提能I .用括号内所给动词的适当形式填空Lit is wis

5、e to take (take) such gifts with gratitude.He will find it is easy to make (make) friends in this city.To get (get) there by bike will take us half an hour.It is an offence to drop (drop) litter in the street.5.When to leave (leave) for London has not been decided yet.6.1fs necessary fbr you to lock

6、 (lock) the car when you do not use it.n.补全句子.Reading books every day is a good habit.每天读书是个好习惯。.To make friend with them is nice.和他们交朋友真是令人愉快。3.Its kind of you to do me a favour.你能帮助我真是太好了。“Walking after suppei does good to your health.晚饭后散步对健康有好处。5.It is impossible for lost time to be made up.弥补失去的时间是不可能的。6.It i