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1、The use of “it”(I)1.Its a small world after all.3.Its a fine day,isnt it?2.A bird landed on the tree.Its singing.4.What time is it? Its seven oclock.5.The baby is crying.It might be hungry.this/thatI.人称代词 a.用作人称代词，代替前文提到过的事物，以避免重复: b.也可以指动物或婴儿(未知性别的婴儿或孩子):2.非人称代词 有时并不指具体的东西，可指天气、时间、距离、环境等 It was ver
2、y quiet in the caf. It is half an hours walk to the city. 3.指示代词 指代this或that This is your pen, isnt it? Whats that on the desk? I guess it might be a robot.It is obvious that goingfor sports will do a lotof good to your health.Its a pity that the Chinese team doesnt attendthe World Cup in South Afri
3、ca this year.4. it作形式主语(Preparatory Subject) 代替不定式，动名词或从句所表示的真正主语。 People believed that the man didt tell a lie. Its believed that the man didt tell a lie. The two sides are said to have reached an agreement. Its said that the two sides have reached an agreement. The sword has been proved to date fr
4、om Qin Dynasty. It has been proved that the sword dated fromQin Dynasty. How early man was able to construct Stonehenge isa mystery. Its a mystery how early man was able to constructStonehenge.it作形式主语的句型常见的有：It is clear ( obvious， true， possible， certain.) that It is said (reported，believed.) that .
5、 It is suggested ( ordered /demanded/insisted/commanded. ) that .从句用虚拟语气 It is a pity ( shame/duty/fact/honor/no surprise. ) that .It happens (seems， looks， appears ) that. . It doesnt matter( no wonder)+wh-/how-clause It takes sb. . to do sth It is no good (use ) doing sthIt looks ( seems ) as if .
6、归纳5.作形式宾语( Preparatory Subject )为了记忆方便我们把该句型总结为“6123结构“ 。 6指主句中常用的动词：think,believe,make,find,consider,feel； 1指的是形式宾语it； 2指的是宾补的两种形式：形容词或名词； 3指的是真正宾语的三种形式：不定式短语，动名词短语或从句。We think it our duty to clean our classroom every day. He felt it important learning English well. They found it difficult that the
7、y would finish their work in two days.It was with a strong belief that Martin Luther king led mang movements against racial discrimination.6.用于强调结构（emphatic structure ） It is/was + 被强调部分 + that/who.+其他成分 I met Tom in the street yesterday.强调结构的一般疑问句型：Is/was + it + 所强调的部分 + that / who?Was it you that
8、met Tom in the stress yesterday?强调结构的特殊疑问句型：疑问词 + is/was + it + that/who? Who was it that you met in the street yesterday?Where was it that you met Tom yesterday?.notuntil.句式用于强调句型要注意否定词 not 前移 构成：It is/was not until + 被强调部分 + that .I didt go to bad until 10 oclock yesterday evening. It was not unti
9、l 10 oclock yesterday evening that I went to bad.I didnt realize she was a famous film star until she took off her dark glasses. It was not until she took off her dark glasses that I realized she was a famous film star.3.It is no use (和他们争论这一问题), you are simply wastingtime. (argue) 6.His parents man
10、ageed to (使成为可能 ) for him to go abroad. (possible)4._（不要紧/没关系）whether we go together or separately.( matter)7. According to the witnesses, it was at two oclock ( 该事故发生 ). ( happen )1. ( 正在下雨 ) when they left the station.( rain )2. ( 对他来讲很困难 ) to study two languages. ( difficult )8. ( 正是在这片耕地上 ) that
11、 the farmers produce food for thewhole population of China. ( arable )10. It ( 直到他们联手 ) that they achieved their goals.( join )9.It ( 直到1920 年) that regular radio broadcasts began. ( until)5. (普遍认为)that Chinas fast development in economy willbenefit many countries in the world.( generally, believe )1.It was raining 2.Its difficult for him 3.arguing with them about this question 4.It doeant matter 5.Its generally believed 6.make it possible 7.that this accident happened 8.It is on this arable land 9.was not until 1920 10.was not until they joined hands
