錯(cuò)省介詞by。比如：

Who wrote this novel?

誰寫了這本小說?

錯(cuò)誤：Who was this novel written?

正確：Who was this novel written by?

解析：主動(dòng)句是以who, what, which等作主語(yǔ)開頭的特殊疑問句,變?yōu)楸粍?dòng)句時(shí),介詞by不能省略。它可以放在被動(dòng)結(jié)構(gòu)后面,也可以和疑問代詞who, what或者which一起放在句首,但who須用賓格形式。比如：What made you so troubled? =By what were you made to troubled? (你被什么搞得這么心煩意亂的?)

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