It's very kind of you to say so.

　　2. 不定式作表语: 不定时常用在系动词be, seem, appear, get, remain等后作表语. 主语多用aim, duty, hope, idea, intention, plan, job, suggestion, wish, purpose, task等抽象名词或以what引导的主语从句, 后面的不定式说明其内容.

　　My idea is to climb the mountain from the north.

　　What I would suggest is to put off the meeting.

　　3. 不定式用作宾语: 在ask, agree, care, choose, demand, decide, expect, fail, help, hope, learn, manage, offer, plan, prepare, pretend, promise, refuse, want, wish等动词后只能用不定式作宾语.

　　Tom refused to lend me his pen.

　　We hope to get there before dark.

　　The girl decided to do it herself.

　　注意: 在某些及物动词, 如think, believe, consider, feel, find, make等后常用it作形式宾语.

　　Technology makes it possible to realize our dream.

　　4. 不定式作定语

　　1) 不定式作定语需要后置.

　　Ladies and Gentlemen, I have something important to tell you.

　　She is always the first to come and the last to leave.

　　2) 作定语的不定式与被修饰的名词或代词存在着三种主要的逻辑关系, 既被修饰的名词和代词是不定式的逻辑主语或逻辑宾语或同位关系.

　　动宾关系

　　I have a lot of work to do.

　　Give me a piece of paper to write on.

　　主谓关系

　　She is the best person to finish the work.

同位关系: 不定式前面的名词是它修饰的对象, 它所修饰的名词多为抽象名词. 如: need, time, way, right, chance, courage, reason, wish, movement等.