(1)将一个句子由主动语态转换为被动语态时,可按下列步骤进行:①先将主动结构的宾语改为被动结构的主语;②再将主动语态动词改为被动语态动词;③最后在被动语态之后加介词by,并将主动结构的主语放在by之后(经常被省略),构成介词短语;④由主动语态动词改为被动语态动词时,要注意被动语态动词中助动词be的各种形式变化,因为被动语态动词的不同人称和数是由助动词be不同的形式来表示的,如:Trees are planted every spring.(2)如果主动语态动词后又有直接宾语,又有间接宾语,一般是将间接宾语改为被动语态句中的主语,将直接宾语保留在原处。如将直接宾语改为被动语态句中的主语,将间接宾语保留在原处时,一般要在间接宾语前加介词to或 for,如:Grandma told me an interesting story last night.→Iwas told an interesting story last night./ An interesting story was told to me last night.
(3)主动语态中的宾语加带有宾语补足语时,改为被动语态时,就将宾语改为主语,将宾补保留在原处,而成为被动语态句中主语的补足语了。宾补可以有下列几种情况:①宾补为动词不定式,如:They asked her to sing a song. →She was asked to sing a song. 在动词make, see, hear, watch, notice等之后,不定式的to在主动语态里可要省略,而被动语态里不能省,如:Tom was seen to come out of the lab.②宾补为分词,如:They heard them singing at the time.→They were heard singing at that time.③宾补为形容词、副词、名词或介词短语,如:She kept me busy all the morning. →I was kept busy all the morning.
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