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1、Unit 2, Healthy LifestyleGrammar动词不定式作主语教材链接(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.观察上面句子，动词不定式在这些句子中作的是主语；it在句中为形式主语。要点精析动词不定式作主语时，相当于名词或代词的作用，一般表示具体的、一次性的动作。1 .单个不定式作主语时，谓语动词通常用第三人称单数形式。两个或两个以上的不定 式作主语时，假设语意基本一致或不定式作为一个整体，谓语动词用单数；假设语意不一致，那么 用复数。To get enough protein each day is beneficial to our health.每天摄取足够的蛋白质对我们 的健康有益。To
3、love and to be loved is sweet to us.爱和被爱对我们来说都是甜蜜的。To improve peoples lives and to speed up social construction are two important tasks. 改 善人们的生活和加快社会建设是两项重要任务。2 .动词不定式作主语时，假设不定式太长，为防止头重脚轻，常用it作形式主语，将真 正的主语置于后面。It is impossible to rely on your parents all your life.你不可能一辈子都依靠你的父母。It is essential to
4、reserve a table in advance of festivals.在节日前预订桌位是有必要的。3 .常用句型It is+adj.+ (for/of sb.) to do sth.如果形容词表示的是不定式的逻辑主语的性质、身份、特点，如careless, clever, good, kind, foolish, honest, lazy, nice, silly, wise 等，用介词 of。如果形容词表示的是事物或行为的特点或性质，如difficult, easy, hard, important, impossible, necessary, inconvenient, ess
5、ential 等，用介词 for。It is impolite of you to disturb others.打搅他人是不礼貌的。It is difficult for us to finish writing the composition in a quarter of an hour. 在十五分钟内 写完这个作文对我们来说太难了。(1) It is+.+to do sth.做某事是It is a hard task to change long habits in a short time.要在短时间内改掉长期养成的习惯是一项艰巨的任务。It is a doctors duty to
6、 heal the wounded and rescue the dying.救死扶伤是医生的职责。(2) It takes/took sb. some time to do sth,做某事花费某人多长时间It takes us nine years to build the Hong Kong-Zhuhai-Macao Bridge.建造港珠澳大桥花费 了我们9年的时间。It took me more than an hour to do my homework yesterday.昨天我做作业用了一个多小 时。实战演练I.单句语法填空1 .(2020 课标全国ni)It is tradit
7、ional(bring) a gift to a housewarming party.2 . (2020 课标全国HI) Its hard(tell) exactly how many people agree with him, but research indicates that the numbers have been rising for some time.3 .(2020 江苏)The implication of these results is that to gain the greatest health benefits from exercise, it may
8、be wise(skip) eating first.4 . (2019 课标全国 I ) It is difficult(figure) out a global population of polar bears.5 . (2019 天津)Then we will know how importantis to have meaning in our life.6 .Coming out of this experience, I realize its OK(be) different from others.6.1 t was impolite you to speak to an o
9、utstanding teacher like this.1.1 t took years of work(reduce)the industrial pollution and clean the water.1.2 ts very important the new comers to study some rules.10 .To lose heart(mean) failure.11 .完成句子L我认为你问面试会持续多久是不礼貌的。(impolite)I think how long the interview will last.2 .她花了一个多小时的时间来分析这些有助于她写研究报
10、告的数据。(analyze) which helped her write research reports.3 .事实上，一开始就进行太多的锻炼对你的身体健康是有害的。(不定式作主语)Actually ,bad for your physical health.4 .汤姆很固执，所以你要说服他改变主意是很不容易的。(persuade sb. to do sth. ; change ones mind)Tom is stubborn, so.5 .那位老人无私地把食物送给街上无家可归的人。(selfless; give away)to the homeless in the street.6
11、.父亲批评了我并告诉我捉弄别人是错误的。(play tricks on sb.)Father criticized me and told me.7 .成为一名专业的运发动不容易，需要日复一日的坚持。(不定式作主语)8 and it needs persistence day in and day out.9 ,无人驾驶汽车什么时候能够在道路上随处可见，这是很难预测的。(it作形式主语) when driverless cars will be seen everywhere on the roads.10 对于外国人来说，能够自由使用筷子不是一件容易的事。(it is+几+to do sth
12、.)chopsticks freely.11 .如今，很多人意识到教给孩子书写技巧是很有必要的。(it作形式主语)Nowadays, many people realizethe skill of handwriting. 参*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. means12 . 1. it is impolite of you to ask 2. It took her more than an hour to analyz
13、e 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 was wrong to play tricks on others 7. To be a professional athlete is not easy 8. It is hard to predict 9. It is not an easy thing for the foreigners to use 10. it is necessary to teach children