【成考英語(yǔ)】2009年成人高考英語(yǔ)語(yǔ)法被動(dòng)語(yǔ)態(tài)六：現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)

六、現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)
    承受者+have（復(fù)數(shù)主語(yǔ)）/has been done by+執(zhí)行者 （不明確可省略）
    E.g. 主動(dòng)：Our School has finished many scientific researches.
    被動(dòng)：Many scientific researches have been finished by our school.