【成考英語(yǔ)】2009年成人高考英語(yǔ)語(yǔ)法被動(dòng)語(yǔ)態(tài)二：一般過(guò)去式的被動(dòng)語(yǔ)態(tài)

二、一般過(guò)去式的被動(dòng)語(yǔ)態(tài)
    承受者+be{was/were +done（過(guò)去分詞） by+執(zhí)行者 （不明確可省略）。
    E.g.： 主動(dòng)：He repaired his bike yesterday.
    被動(dòng)：His bike was repaired by him yesterday.
    主動(dòng)：Children cleaned many streets last Sunday.
    被動(dòng)：Many streets were cleaned by children last Sunday.