人教版(新教材)高中英語選修3Unit2 Healthy Lifestyle學(xué)案2：Grammar

1、Unit 2, Healthy LifestyleGrammar動詞不定式作主語教材鏈接(1)(教材 P14) However, during this period, it can be easy for some of them to form badhabits.(2)(教材 P14) To change bad habits is never easy, even with many attempts.(3)(教材 P15) After all, it is not easy to break bad habits.(4)(教材 P16) Changing a bad habit is

2、 difficult, and it is easy to make excuses and giveup.觀察上面句子，動詞不定式在這些句子中作的是主語；it在句中為形式主語。要點精析動詞不定式作主語時，相當(dāng)于名詞或代詞的作用，一般表示具體的、一次性的動作。.單個不定式作主語時，謂語動詞通常用第三人稱單數(shù)形式。兩個或兩個以上的不定 式作主語時，假設(shè)語意基本一致或不定式作為一個整體，謂語動詞用單數(shù)；假設(shè)語意不一致，那么 用復(fù)數(shù)。To get enough protein each day is beneficial to our health.每天攝取足夠的蛋白質(zhì)對我們 的健康有益。To lo

3、ve and to be loved is sweet to us.愛和被愛對我們來說都是甜蜜的。To improve peoples lives and to speed up social construction are two important tasks. 改 善人們的生活和加快社會建設(shè)是兩項重要任務(wù)。.動詞不定式作主語時，假設(shè)不定式太長，為防止頭重腳輕，常用it作形式主語，將真 正的主語置于后面。It is impossible to rely on your parents all your life.你不可能一輩子都依靠你的父母。It is essential to rese

4、rve a table in advance of festivals.在節(jié)日前預(yù)訂桌位是有必要的。.常用句型It is+adj.+ (for/of sb.) to do sth.如果形容詞表示的是不定式的邏輯主語的性質(zhì)、身份、特點，如careless, clever, good, kind, foolish, honest, lazy, nice, silly, wise 等，用介詞 of。如果形容詞表示的是事物或行為的特點或性質(zhì)，如difficult, easy, hard, important, impossible, necessary, inconvenient, essential

5、 等，用介詞 for。It is impolite of you to disturb others.打攪他人是不禮貌的。It is difficult for us to finish writing the composition in a quarter of an hour. 在十五分鐘內(nèi) 寫完這個作文對我們來說太難了。It is+.+to do sth.做某事是It is a hard task to change long habits in a short time.要在短時間內(nèi)改掉長期養(yǎng)成的習(xí)慣是一項艱巨的任務(wù)。It is a doctors duty to heal the

6、wounded and rescue the dying.救死扶傷是醫(yī)生的職責(zé)。It takes/took sb. some time to do sth,做某事花費某人多長時間It takes us nine years to build the Hong Kong-Zhuhai-Macao Bridge.建造港珠澳大橋花費 了我們9年的時間。It took me more than an hour to do my homework yesterday.昨天我做作業(yè)用了一個多小 時。實戰(zhàn)演練I.單句語法填空.(2020 課標(biāo)全國ni)It is traditional(bring) a g

7、ift to a housewarming party. (2020 課標(biāo)全國HI) Its hard(tell) exactly how many people agree with him, but research indicates that the numbers have been rising for some time.(2020 江蘇)The implication of these results is that to gain the greatest health benefits from exercise, it may be wise(skip) eating f

8、irst. (2019 課標(biāo)全國 I ) It is difficult(figure) out a global population of polar bears. (2019 天津)Then we will know how importantis to have meaning in our life.Coming out of this experience, I realize its OK(be) different from others.t was impolite you to speak to an outstanding teacher like this.t took

9、 years of work(reduce)the industrial pollution and clean the water.ts very important the new comers to study some rules.To lose heart(mean) failure.完成句子L我認(rèn)為你問面試會持續(xù)多久是不禮貌的。(impolite)I think how long the interview will last.她花了一個多小時的時間來分析這些有助于她寫研究報告的數(shù)據(jù)。(analyze) which helped her write research reports

10、.事實上，一開始就進(jìn)行太多的鍛煉對你的身體健康是有害的。(不定式作主語)Actually ,bad for your physical health.湯姆很固執(zhí)，所以你要說服他改變主意是很不容易的。(persuade sb. to do sth. ; change ones mind)Tom is stubborn, so.那位老人無私地把食物送給街上無家可歸的人。(selfless; give away)to the homeless in the street.父親批評了我并告訴我捉弄別人是錯誤的。(play tricks on sb.)Father criticized me and t

11、old me.成為一名專業(yè)的運發(fā)動不容易，需要日復(fù)一日的堅持。(不定式作主語)and it needs persistence day in and day out.,無人駕駛汽車什么時候能夠在道路上隨處可見，這是很難預(yù)測的。(it作形式主語) when driverless cars will be seen everywhere on the roads.對于外國人來說，能夠自由使用筷子不是一件容易的事。(it is+幾+to do sth.)chopsticks freely.如今，很多人意識到教給孩子書寫技巧是很有必要的。(it作形式主語)Nowadays, many people r

12、ealizethe skill of handwriting. 參*考*答*案 I . 1. to bring 2. to tell 3. to skip 4. to figure 5. it 6, to be 7. of 8. to reduce 9. for 10. means. 1. it is impolite of you to ask 2. It took her more than an hour to analyze the data 3. to start with too much exercise is 4. its not easy for you to persuade him to change his mind 5. Its selfless of the old man to give away food 6. it w