用主动形式表示被动意义的词
1. 感官性动词 feel , look , smell , sound , taste 等无被动形式,要用主动形式表示被动意义。如: Cotton feels soft.   The flowers smell sweet.
weigh的各种形式2. 英语中有些不及物动词和词组,只有主动形式,常被视为主动形式表示被动含义。常见有的: happen , take place , break out, come about , come out 等。如:1) What has happened over there        2)How did it come about
3. 有些表示静止状态的及物动词或动词短语不能用于被动语态,须用主动形式表示被动意义。常见的有 have , cost , lock , last , own , suit , hold , fit , join , consist of , belong to , agree with 等。如:1) The book costs 150 yuan. 2)  Does the key fit the lock      3)Your statement lacks detail.
4. 一些常见的动词如 cut , drive , drink , keep , number , open , pay , prove , read , sell , wash , wear , weigh , write 也常用主动形式表示被动意义。如: 1)The matter will keep until morning.  2) The dictionary sells for 50 yuan.     3)The pen writes quite smoothly.
5. 动名词主动形式表示被动意义的情况:
( 1 ) worth 的主语通常是物,但其后面跟动名词的主动形式表示被动意义,不能接不定式的被动式。如: The book is well worth reading.
( 2 )动词 need , require , want 作“需要”解时,其后跟非谓语动词作它的宾语时,必须用动名词的主动形式表示被动意义,相当于不定式的被动式。如: The window needs / requires / wants cleaning / to be cleaned.

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