新建 Microsoft PowerPoint 幻灯片.ppt

10. You could suffer from bad health if you keep smoking. ( It is likely). 11. China produces one third of the world’s cigarettes. It is reported. * Grammar The use of “it” 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(未知性别的婴儿或孩子): Is this your dog？No, it isn’t. 一、it 作人称代词 1.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. 2. 指时间: It was nearly midnight when she came back. 3. 指环境: It was very quiet in?the?café. 4. 指距离： It is half an hour’s?walk?to the city centre from my home. 二、it作非人称代词 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。 三、it用作形式主语 5. 指日期： --Whats the date today? --Its May 1, 2007. 6. 指季节： It is summer now. 7. 指度量： It is about 5 kilograms. 8. 指价值： ----Whats the cost of the T-shirt? ----It is 150 yuan. Discovering “It” 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. 天气 距离 日期 时间 形式主语 环境 形式主语 （1）It be adj.（for sb.）to do sth. 此处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，ill-mannered，polite，impolite，clear，obvious，certain，suitable，proper，fit，useful，useless，dangerous… It is illegal（for a teenager）to drive a car without a license. 　　 1. 代作主语的动词不定式 （2）It be adj. of sb. to do sth. 此处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. Its 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. (3) It替代作主语的动名词的常见句型 2. it作形式主语替代主语从句 It is clear ( obvious，true，possible, certain …) that ... 该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为“清楚