動(dòng)詞不定式

　　(1)作主語(yǔ)

　　To learn a foreign language is not easy.

　　It is not easy to learn a foreign language.

　　(2)作賓語(yǔ)

　　They began to read.

　　(3)作賓語(yǔ)補(bǔ)足語(yǔ)

　　Jim asked me to help him with his lessons.

　　We often heard her sing.

　　(4)作定語(yǔ)

　　I have an important meeting to attend.

　　(5)作狀語(yǔ)

　　She went to see her grandma yesterday.

　　(6)用在how, when, where, what, which等之后

　　I don’t know how to use a computer.

　　Do you know when to start?

　　He didn’t know what to do next.

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