來源:中考網(wǎng) 作者:紫涵 2013-01-30 16:04:57
	  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(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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