人教版(新教材)高中英語選修3Unit2 Healthy Lifestyle學案1：Grammar

1、Unit 2 Healthy Lifestyle Grammar 不定式作主語K觀察例句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歸納用法L把不定式置于句首。如：To get the

2、re by bike will take us half an hour.騎自行車到那兒將花費我們半個小時。To make a plan first is a good idea. 首先制定好計劃是個好主意。.用it作形式主語，把真正的主語不定式置于句后，常用于以下句式中。如: (l)It+be+名詞+ to doIt*s our duty to take good care of the old.照顧好老人是我們的責任。(2)It takes sb. + some time+to doHow long did it take you to finish the work?你花了多少時間來完成

3、這項工作？(3)It+be+形容詞+ for sb.+to doIt is difficult for us to Hnish writing the composition in a quarter of an hour. 我們難以在15分鐘內(nèi)完成這篇作文。(4)It seems(appears) +形容詞+ to doIt seemed impossible to save money. 省錢似乎不可能。(5)It + 不定式結(jié)構(gòu)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.他認為乘火車比擬平安。(6)不定式的完成式也可作句子的主語To have made the same mistake twice was unforgivable.犯同樣的錯誤兩次是不可原諒的。It is better to have loved and lost than never to have loved at all.愛過之后失去了愛，比從未愛過要好。K即學即練口單句語法填空(make) up for lost time is not possible.It is good for your study(discuss) with you

5、r classmates.不定式和動名詞作主語的區(qū)別(1)動名詞作主語通常表示抽象動作；而不定式作主語表示具體動作。Smoking is prohibited here.這里禁止抽煙。(抽象)It is not very good for you to smoke so much.你抽這么多煙對你身體很不好。(具體)(2)動名詞作主語時，通常用以表示一件的事或經(jīng)驗；不定式短語通常用來表示 件未完成的事或目的。Climbing mountains is interesting.爬山很有趣。(經(jīng)驗)To finish the task will take a long time.要完成這項任務將要

6、花費很長時間。(具體)K即學即練2單句語法填空(watch) news on TV has become a routine for me.It took me only five minutes(finish) the job.課后練習I .單句語法填空(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.短文語法填空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.一參*考*答*案,.一K即學即練1 3To maketo discussK即學即練21Watchingto finish課后練習I . 1. To lean 2. To save 3. to