初中英语语法三：动词不定式知识讲稿.ppt

英语专题：动词不定式 ;基本结构：to do; 否定式：not to do; 没有人称和数的变化；在句子中不能担当谓语 时态上：表示将来发生的动作 基本含义： 语态上：通常表示主动 (to be done) 表目的 Last weekend I went to the library _______ some books on how to protect the environment. A. to borrow B. borrow C. borrowed D. borrowing; 动词不定式在句中除不能担当谓语外，可以充当其他任何成分，如主语、表语、宾语、定语和状语等 ; 用动词不定式作主语时，经常有it作形式主语，代替不定式，放在句子的开头，动词不定式则放在谓语的后面, 如： To get up early is a good habit. It is a good habit to get up early. (For us) To Learn English well is easy. It is easy for us to learn English well. ;常用不定式作宾语的动词有： afford 负担得起 agree 同意 ask 要求 refuse 拒绝 choose 选择 decide 决定 learn 学习 expect 期望 hope 希望 want 想要 wish 希望 fail 失败 promise 答应 pretend 假装; 在had better, would rather后面的动词不定式不带 “to”,例如： You had better do it right now. You’d better not go there with them. 在表示感觉的动词如see, feel, watch, hear等及表示 “使役”的动词如make, let, have等后面，动词不定式 省去to；在动词help后面, 动词不定式可以带to，也 不以不带to: Don’t let the children play with fire. We watched him drive off. Food, sleep and exercise help children (to) grow. ; ; ; ;Thank you !