动词不定式精讲精重点.ppt

动词不定式精讲精练 温馨提示 如果不定式与所修饰的名词或代词构成动宾 关系，且不定式为不及物动词，所修饰的名词 如果是地点、工具等时，应加上必要的介词。 * 一、基本形式： to +动词原形，否定式为not to +动词原形。 二、特殊形式：动词原形，否定式为not +动词原形。 The box is too heavy. Let me _______(help) you _____ (carry) it. 2. The question is too hard to answer. Why not _______ (ask) the teacher for help. 3. It’s too late. You’d better _______(go) to bed. 4. ---Would you please _____ (help) me with my English tonight? ---Sure, I will. 5. What makes you _________(think) I’m a farmer? help carry ask go help think 动词不定式作主语时,常用it作形式主语,而把真正的主语动词不定式(或短语)后置以平衡句子。其形式为：It’s+形容词+( for sb )+动词不定式，可以转换为To do sth. is… 例如：To learn English well is very important. =It’s very important to learn English well. 三、功能用法 1.不定式作主语 ① It’s time for sb. to do sth. (该到某人做某事的时候了) ②It’s one’s turn to do sth. (轮到某人做某事了) ③It takes sb. some time to do sth. (花费某人多长时间做某事) 重点句型 1. It’s getting late. It’s time for me _____(leave) now. 2. Today is Monday. It’s my turn ___________ (sweep) the floor. 3. My home isn’t far from our school. It takes me ten minutes ___________ (walk) to school. to leave to sweep to walk 主要结构有： ① seem to do sth.(似乎要做某事). ② One’s dream / ambition / wish / job / duty(职责) is to do sth. (多数情况下，不定式作表语，可转换为做主 语) ③ As a …, the most important thing is to do sth. (作为….,最重要的事情是做……) 用来表示主语的内容，或者表示未来的某种可能性或预计要发生的事。 2.不定式作表语 Look at the clouds in the sky. It seems _______ (rain). 2. I’m an English teacher. My job is ___ (teach) English. 3. As a doctor. The most important thing is _____ (save) people’s lives. 4. I’m good at playing basketball. My dream is ______ (be) a basketball player like Yao Ming. 5. We are students. Our duty is __________(work) hard at each subjects. 6. My sister is 24 years old. Her wish is ____ (marry) a rich man. to rain to teach to save to be to work to marry 3.不定式作宾语 ①常见的有want / would like / hope / try / decide / learn / remember / forget / need / try one’s