人教版(新教材)高中英語(yǔ)選修3Unit2 Healthy Lifestyle學(xué)案1：Grammar

1、Unit 2 Healthy Lifestyle Grammar 不定式作主語(yǔ)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(fèi)我們半個(gè)小時(shí)。To make a plan first is a good idea. 首先制定好計(jì)劃是個(gè)好主意。.用it作形式主語(yǔ)，把真正的主語(yǔ)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(zé)任。(2)It takes sb. + some time+to doHow long did it take you to finish the work?你花了多少時(shí)間來(lái)完成

3、這項(xiàng)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(qián)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(rèn)為乘火車比擬平安。(6)不定式的完成式也可作句子的主語(yǔ)To have made the same mistake twice was unforgivable.犯同樣的錯(cuò)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(ài)過(guò)之后失去了愛(ài)，比從未愛(ài)過(guò)要好。K即學(xué)即練口單句語(yǔ)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(dòng)名詞作主語(yǔ)的區(qū)別(1)動(dòng)名詞作主語(yǔ)通常表示抽象動(dòng)作；而不定式作主語(yǔ)表示具體動(dòng)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(duì)你身體很不好。(具體)(2)動(dòng)名詞作主語(yǔ)時(shí)，通常用以表示一件的事或經(jīng)驗(yàn)；不定式短語(yǔ)通常用來(lái)表示 件未完成的事或目的。Climbing mountains is interesting.爬山很有趣。(經(jīng)驗(yàn))To finish the task will take a long time.要完成這項(xiàng)任務(wù)將要

6、花費(fèi)很長(zhǎng)時(shí)間。(具體)K即學(xué)即練2單句語(yǔ)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(xí)I .單句語(yǔ)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(yǔ)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(xué)即練1 3To maketo discussK即學(xué)即練21Watchingto finish課后練習(xí)I . 1. To lean 2. To save 3. to