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				(二)被動語態(tài)的用法  (1)動作的執(zhí)行者不知道是誰或難以說明時常用被動語態(tài).例如:  Street lights are often turned on at six in winter.    The new test book will be used next term.  (2)當(dāng)動作的承受者比起動作的執(zhí)行者來說更能引起人們的關(guān)心而需要加以強調(diào)時.要用被動語態(tài).例如:  This kind of bicycle is not sold in our shop.  The thief was caught by a policeman yesterday.  (3)含有雙賓語的句子.主動句中的間接賓語或者直接賓語都可變?yōu)楸粍诱Z態(tài)中的主語.另一個保留不變.變?yōu)橹髡Z的若是主動句中的直接賓語.間接賓語前則需加介詞to 或for.  例如:The pianist gave the pupils some advice.         間接賓語 直接賓語  →The pupils were given some advice by the pianist.  →Some advice was given to the pupils by the pianist.  (4)在主動語態(tài)句中動詞make.have.let.see.watch.hear.feel等后接動詞不定式作賓語補足語.動詞不定式不加to.但變成被動語態(tài)時后面的不定式都須加上to.  例如:The boss made them work ten hours a day.    →They were made to work ten hours a day by the boss.    A boy saw him enter the house.     →He was seen to enter the house.			【查看更多】
			


		
           
          


		
          
		
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          將下面被動語態(tài)的句子改為主動語態(tài)
          

          Much tea is drunk by him every day.
          

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          將下面被動語態(tài)的句子改為主動語態(tài)
          

          The work has been finished by Helen.
          

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          將下面被動語態(tài)的句子改為主動語態(tài)
          

          The room is being swept by Xiao Li.
          

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          將下面被動語態(tài)的句子改為主動語態(tài)
          

          Li Ming was praised by the teacher yesterday.
          

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          觀察下列句子中的畫線部分，歸納出各種時態(tài)的被動語態(tài)的構(gòu)成。
          

          1．Rice is grown in the south of China．
          

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          2．The computer is being used now．
          

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          3．The work has been finished．
          

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          4．The thief was caught yesterday．
          

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          5．The girl was being operated on in the hospital．
          

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