區別動詞不定式多種形式的方法：動詞不定式即“to+動詞原形”，有時也可不帶to。動詞不定式保留動詞的特點，但在句中不能作謂語，沒有人稱和數的變化。不定式有自己的賓語和狀語，並同它們構成不定式短語。
1. 作賓語 I want to be a doctor.
2. 作狀語 He has come to live in China with his wife.
3. 作賓語補足語 She asked me to help her.
4. 作定語 I have something interesting to say.
5. 作主語 To learn a new skill is not easy. 注意：動詞不定式作主語通常用it替代，把不定式放在後面。 It is not easy to learn a new skill.
6. 動詞不定式和特殊疑問詞連用 I don’t know what to do next.
7. 不帶to的情況：感官動詞和使役動詞作賓語補足語通常不帶to。 I saw him read books.
區別動詞不定式多種形式的方法：動詞不定式即“to+動詞原形”，有時也可不帶to。動詞不定式保留動詞的特點，但在句中不能作謂語，沒有人稱和數的變化。不定式有自己的賓語和狀語，並同它們構成不定式短語。
1. 作賓語 I want to be a doctor.
2. 作狀語 He has come to live in China with his wife.
3. 作賓語補足語 She asked me to help her.
4. 作定語 I have something interesting to say.
5. 作主語 To learn a new skill is not easy. 注意：動詞不定式作主語通常用it替代，把不定式放在後面。 It is not easy to learn a new skill.
6. 動詞不定式和特殊疑問詞連用 I don’t know what to do next.
7. 不帶to的情況：感官動詞和使役動詞作賓語補足語通常不帶to。 I saw him read books.