人教版(新教材)高中英语选修3Unit2 Healthy Lifestyle学案1：Grammar

1、Unit 2 Healthy Lifestyle Grammar 不定式作主语K观察例句To say is one thing and to do is another.Its rude to turn your back to your teacher and refuse to answer.It is impossible to learn a foreign language without making painstaking effort.It seemed a pity to have wasted so much time.K归纳用法L把不定式置于句首。如：To get the

2、re by bike will take us half an hour.骑自行车到那儿将花费我们半个小时。To make a plan first is a good idea. 首先制定好计划是个好主意。.用it作形式主语，把真正的主语不定式置于句后，常用于以下句式中。如: (l)It+be+名词+ to doIt*s our duty to take good care of the old.照顾好老人是我们的责任。(2)It takes sb. + some time+to doHow long did it take you to finish the work?你花了多少时间来完成

3、这项工作？(3)It+be+形容词+ for sb.+to doIt is difficult for us to Hnish writing the composition in a quarter of an hour. 我们难以在15分钟内完成这篇作文。(4)It seems(appears) +形容词+ to doIt seemed impossible to save money. 省钱似乎不可能。(5)It + 不定式结构可位于 believe/consider/discover/expect/ find/think 和 wonder 之后He thought it would b

4、e safer to go by train.他认为乘火车比拟平安。(6)不定式的完成式也可作句子的主语To have made the same mistake twice was unforgivable.犯同样的错误两次是不可原谅的。It is better to have loved and lost than never to have loved at all.爱过之后失去了爱，比从未爱过要好。K即学即练口单句语法填空(make) up for lost time is not possible.It is good for your study(discuss) with you

5、r classmates.不定式和动名词作主语的区别(1)动名词作主语通常表示抽象动作；而不定式作主语表示具体动作。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)(2)动名词作主语时，通常用以表示一件的事或经验；不定式短语通常用来表示 件未完成的事或目的。Climbing mountains is interesting.爬山很有趣。(经验)To finish the task will take a long time.要完成这项任务将要

6、花费很长时间。(具体)K即学即练2单句语法填空(watch) news on TV has become a routine for me.It took me only five minutes(finish) the job.课后练习I .单句语法填空(lean) out of the window is dangerous.(save) money now seems impossible.It is an offence(drop) litter in the street.It is stupid of you(write) down everything (that) the te

7、acher says.(drive) a car during the rush hour is tiring.II.短文语法填空I have a lot of hobbies 1.I studied in college. It was hard for me to save money 2.(keep) my hobbies. It was foolish of me 3(spend) plenty of time with those.But 4.(study) hard was my first task at that time. I often got up early 5.(ca

8、tch) up with other students. It took me two terms 6.(make) up for my lost time. I think 7.(make) the same mistake is not wise because 8.(become) a surgeon is not easy. I should take hold of the good chance and spare no effort 9.(achieve) my goal. Now, Pm a doctor, 10.I will never forget the experience in that time.一参*考*答*案,.一K即学即练1 3To maketo discussK即学即练21Watchingto finish课后练习I . 1. To lean 2. To save 3. to