Unit3AhealthylifeDiscoveringusefulstructures课件（人教版选修6）.ppt

Unit 3;The use of “it” (1); It rains heavily. 2. It is 20 kilometers from Granddads house to James’. 3. It is November 11, 2005. 4. It is 9 o’clock at night. 5. Itll be lovely in the garden tonight． 6. It is bad to smoke. 7. It is likely that he will succeed.;“It” is a very useful word in English and can be used in many ways. ;;It is a warm sunny afternoon. It was nearly midnight that she came back. It is very noisy outside. It is half an hour’s walk to the city centre.;1. it的最基本用法是作代词，主要指刚提到的 事物，以避免重复。 Xi’an is?a?beautiful?city, isn’t?it? 2. 也可以指动物或婴儿 Is this your dog？No, it isn’t.; it有时并不指具体的东西，而泛指天气、时间、 日期、距离、价值、度量、温度、环境等， 称为非人称的it： 指天气：It is a lovely day, isn’t?it? It is a bit windy. 指时间: It was nearly midnight when she came back. 指环境: It was very quiet in?the?café. 指距离：It is half an hour’s?walk?to the city centre from my home.;指日期： -- Whats the date today? -- Its May 1, 2007. 指季节：It is summer now. 指度量：It is about 5 kilograms. 指价值： Whats the cost of the T-shirt? It is 150 yuan.;替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。; (1) It be + adj.+ (for sb.) to do sth. 此处的adj. 通常为描述事件的形容词：easy， difficult，hard，necessary，unnecessary， possible，impossible，likely，unlikely， right，wrong，important，unimportant， legal，illegal，well-mannered，impolite， ill-mannered，polite，clear，obvious， certain，suitable，proper, useful，useless, dangerous… It is illegal (for a teenager) to drive a car without a license.; (2) It be + adj. + of sb. to do sth. 此处的adj. 通常为描述人的形容词：kind， unkind，nice，rude，cruel，considerate， thoughtful，thoughtless，careful， careless，silly，foolish，stupid，clever， wise，crazy. It’s kind of you to help me with the problem.;Its no good/use doing… Its（well）worth doing… Its（well）worth ones while doing/to do… Its???well）worth while doing/ to do Its no use crying over spilt milk.;2. it作形式主语, 替代主语从句;It is said /reported/ learned