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1、it 的用法用作人称代词：1、指代事物： Whats this? Its a cat. 2、指代人：常用于不知对方性别时，比如：询问敲门人或打电话时询问对方是谁，或者用来指代婴儿。(1)Whos it?Its Sam. (2)Whos the baby in the picture? Its my younger brother. 二、用作非人称代词：指代天气、时间、季节或距离等，此时的 it 无意义。(1)Its two oclock now. (2)Its very cold in spring in the northern China. (3)Its about 100 kilomet
2、ers from our town to the big city. 3、用作替代词：it 可作形式主语、形式宾语，可代替不定式、动名词或从句。(1)It is not known where she has gone. (2)Its bad for your eyes reading in bed.(3)It is clever of him to work out the math problem. 4、用于强调句，构成“It+be +被强调部分 that”结构。如：Its in the small shop that I bought the important book. 5、在初中英
3、语教材中，出现了许多由 it 引导的固定句式，现归纳如下： (一)Its time for sb. to do sth. / Its time for sth.意为是(某人)该干的时间了、到的时候了。例如： 1. Its time for supper to have supper.该吃晚饭了。2. Its time for me to study.我该学习了。(2)It takes (sb.) some time to do sth.意为(某人) 花 时间做某事 。例如：1. It takes twenty minutes to go to school by bike. 骑自行车上学要花二
4、十分钟的时间。2. It took me a week to finish reading the book. 我花了一周时间读完这本书。 (3)It is ones turn to do sth.意为 轮到某人做某事了。例如：Its your turn to be on duty tomorrow. 明天轮到你值日了。 (4)It is has been 时间段since 一般过去时，意为 自从以来已过了( 时间)。例如：1. It is / has been four days since I caught a cold. 我感冒已四天了。 2. It is / has been two
5、weeks since we met last. 自从我们上次见面以来已过了两周。(5)It seems seemed that 从句，意为 看起来好像。例如：It seemed that our team was going to win. 我们队看起来好像要赢了。 (6)Its表语to do sth.。例如：Its a good idea to go out for a walk. 出去散步是个好主意。 (7)Its adj. that 从句。例如：Its true that I may fall behind the other students.我真可能落在别的学生后面。(8)Itsa
6、dj. of(for)sb.to do sth.。对于这个句型究竟用 of 还是用 for，主要取决于前面的形容词。如果形容词是描述不定式行为者的性格、品质等的，如 kind，good，nice，clever 等用 of；如果形容词仅仅是描述行为的则用 for，这类形容词常见的有difficult，easy，hard， important，dangerous 等。例如：1. It is nice of you to come to see me.你能来看我真好。2. It is dangerous for children to play with fire.对小孩儿来说玩火是危险的。 典例
7、（ ）1.Whos knocking at the door? I dont know. Maybe _ is my uncle. A. he B. that man C. it D. She（ ）2.I have only two dollars with me. Oh, _ enough to buy this book.A. its B. thats C. youre D. theyre（ ）3.Whos that baby in the photo? _ me. I was only two years old that year. A. Thats B. Its C. Im D. T
8、he babys（ ）4._ five years since I left that town. A. Thats B. Theyre C. The times D. Its（ ）5._about ten minutes walk from my home to the factory. A. The way is B. Its C. The road D. Thats（ ）6.Something is in the box, _ ? A. are they B. arent they C. isnt it D. isnt something （ ）7._ said that the str
9、ange man lives in the deep forest. A. Its B.I C.He D. Someone（ ）8._ take me much time to write that paper. A, Its B. Itll C. Thatll D.Ill（ ）9.I found _ easy to swim across that river. A. it B. that C. me D. itsIt 放在 found 动词后面做宾语 -形式宾语，代替 to do 这个不定式结构（ ）10.Whos that speaking? _ me, Tom. A. Im B. Th
10、ats C. Its D. Its提高训练： 完成句子 1. 从学校到工厂需要步行 20 分钟。_ 20 minutes walk _ the school _ the factory.2. 这个婴儿才两岁，需要人照顾。The baby is only 2 years old. _ needs _ _ _ after. 3. 快点！要下雨了。_ _ ! _ is going to rain.4. 桌上有些面包，吃起来挺香的。deliciousThere is some bread on the table. _ tastes _.5. 要完成这项工作至少需要 20 天时间。Finish at least_ will take _ _ 20 days _ _ the work.
