1．作主語。 如：

　　To learn English is very important.

　　但實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詞后作真正的主語。

　　如上句可表達為：

　　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．作賓語補足語。

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

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

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

　　如： We often see Miss Li clean the classroom.

　　c. let, make, have這些使役動詞后接不帶to的動詞不定式作賓語補足語。但在被動語態中這些不帶to的都須帶上to。

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

　　d.動詞help接動詞不定式作賓語補足語，可帶to也可不帶to。

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

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