it作形式主语和形式宾语

1、12. I find it difficult to remember new words. ( P 144 ) 3. Its not easy to learn English ( P 147 )Step 1 Display:Three sentences in Unit 10 :1. I find it difficult to understand foreigners. ( P143 ) 2it +谓语+adj. + (of sb. / for sb. )to do sthStep 2 Explanation: it作形式主语(form subject)，真正主语由不定式( to do

2、 )或不定式短语（to do sth） 充当。e. g. a. Its never too old to learn . 活到老，学到老。 b. Its very kind of you to help me. 你能帮我真是太好了。 c. It is difficult for the child to carry the box. 这孩子要拿动这个盒子困难。3观察例b和例c，想想何时用of ,何时用for ?b. Its very kind of you to help me. 观察of前的adj. ,如果这个形容词可用来描述人， 如：clever, kind, careful, carel

3、ess, foolish, stupid ,那么就用of . 上句可理解为：You are very kind.思考4 如果形容词不是用来描述人，如：difficult, easy, hard，则选用for . c. It is difficult for the child to carry the box. 上句 ：To carry the box is difficult . Not :The child is difficult思考观察例b和例c，想想何时用of ,何时用for ?5小试牛刀：2003 16. It is careless _ the same mistake agai

4、n and again.A. for you making B. for you to make C. of you making D. of you to makeD6直击高考： 2001 14. Its hard _ so much work in one day. A. for him doing B. of him doing C. for him to do D. of him to do2002 17. _ is impossible to get to the place in 20 minutes.A. He B. That C. It D. This2009 34. _ is

5、 clear that you will get a good job because you are good at communication. A. This B. That C. It D. WhichCCC7二、 主语+谓语+it + adj. + ( for sb.) to do sth. it 作形式宾语（form object），真正宾语由 to do (短语)充当e. g. I think it is difficult for him to solve the problem.8直击高考：2005 24. Do you think _ necessary for us to

6、 deposit the money ?that B. it C. we D. them2007 34. I think _ quite necessary to help each other.A. that B. which C. this D. it2010 29. I found _ for me to finish the work by myself.A. this hard B. that hard C. them hard D. it hardBDD91. I find it difficult ( finish ) my task in five days . 2. Is n

7、ecessary for us to finish the wall newspaper before the Teachers Day .this B. it C. that D. what3. 改错：He finds this natural to work for the good of the society.to finish Bthis 改为：itFurther exercise :10拓展：1.下列句中的IT作什么成分呢？a. Its said that Tom has come back from Shanghai.b. Its doesnt matter whether it is true or not.c. I hate it when people talk with their mouth full.d. I think its natural that we should serve