肯定结构： to + do否定结构： not + to do用法：动词不定式具有名词，形容词 和副词的特征，它在句中可充当主语，宾语，定语，表语和状语．（一）作主语1. To learn English well is not easy.It is not easy to learn English well.2. To listen to his speech is a great pleasure. It is a great pleasure to listen to his speech.( 二）作表语1. My job today is to cook lunch and do some cleaning.2. Our plan is to have a picnic in the morning.（三）作宾语1.He decided to buy some flowers for her.2.She wants to apologize for being late.3.Please don’t forget to bring your medicine next time.( 四）作定语1.I have many things to do today.2.She has something important to tell you.3.He is always the first one to arrive at the school every day.（五）作状语1. He has come to clean the carpet for us.2. My brother rode to his friend’s home to have a party.3. He is too young to lift the bucket of water.4. Are you old enough to join the army?5. I am glad to see you again.ExercisesI. 选择填空1.We had no chairs _____. A. sit B. to sit in C. be sit D. to sit2. These are both very good. I can hardly decide _____. A. which to buy B. which will buy C. what to buy D. what will buy3.The boy was too frightened ____ when he saw the dog. A. not to move B. to move C. so to move D. to be movingB A B4. He is ____ the apples in the tree. A. too tall to reach B. to tall to reach C. tall enough to reach D. enough tall to reach5.After working for more than one hour, they stopped ___ .A.resting B. to have a rest C. having a rest D. rest6. You ___, as it is raining outside.A.had better not to go out B.had not better go out C. Had better to not go out D. had better not go outCBD7. ___ the way to the bookshop was ...
