1．作主語。 如：

　　To learn English is very important.

　　但實(shí)際上不定式作主語常用 it來作形式主語，而將不定式移至謂語動(dòng)詞后作真正的主語。

　　如上句可表達(dá)為：

　　It's very important to learn English.

　　2．作表語。 如：

　　My idea is to ring him up at once.

　　3．作賓語。 如：

　　I have decided to go to Binjiang Primary School.

　　4．作賓語補(bǔ)足語。

　　a. ask, want, teach, tell, know, would like, allow等動(dòng)詞后面接動(dòng)詞不定式作賓語補(bǔ)足語。

　　如： The policemen asked him to get off the bus.

　　b. hear, see, look at, feel, watch, notice, listen to等動(dòng)詞后接不帶to的動(dòng)詞不定式作賓語補(bǔ)足語。

　　如： We often see Miss Li clean the classroom.

　　c. let, make, have這些使役動(dòng)詞后接不帶to的動(dòng)詞不定式作賓語補(bǔ)足語。但在被動(dòng)語態(tài)中這些不帶to的都須帶上to。

　　如： In those days the bosses often made the workers work day and night.

　　d.動(dòng)詞help接動(dòng)詞不定式作賓語補(bǔ)足語，可帶to也可不帶to。

　　如： Can you help me (to) carry the heavy bag?
 

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