##### 不定式 - 不定式 - 不定式是动词的非谓语形式, 一般表示动作的目的或结果, 可作主语, 宾语, 补语等 - 基本结构 - to + 动词原形 - 不定式句法功能 - 不定式作主语 - To master a language requires painstaking effort. (要掌握一门语言非下苦功不可) - It requires painstaking effort to master a language . (要掌握一门语言非下苦功不可) - 不定式作表语 - The important thing is to save lives. (重要的是挽救生命) - The point is how to control yourself (关键在于如何自控) - 不定式作宾语 - We chose not to go home until ten. (我们决定不到10点不回家) - 不定式作宾补 - I advised him to stop smoking. (我劝他戒烟) - They made the boy (to) go to bed early. (他们让孩子早点睡觉) - 不定式作定语 - She has made a decision to leave. (她已经作出了要离开的决定) - They thought of ways to protecttheir crops. (他们想出了保护庄稼的方法) - 不定式作状语 - He studies hard to pass the exam. (他努力学习以通过考试)