Infinitive(动词不定式)

　　1. As Subject and Predictive (用作主语和表语)

　　2. As Object (用作宾语)

　　3. As Complement (用作补足语)

　　4. Indicating Purpose/Result　(表示目的和结果)

　　5. Modifying Adjective　(修饰形容词)

　　6. As Postmodifier in a Noun Phrase (后位修饰名词)

　　7. Wh-Words + to Verb (Phrase)(疑问词+不定式（短语）)

　　8. To Be + V-ed, to Have + V-ed, to Be V-ing (不定式的被动式、完成式和进行式 )