主动变被动 I have finished my composition for an hour

I have left my dictionary in the classroom 主动变 被动语态 主动变被动 I have finished my composition for an hour 英语：主动变被动,被动变主动. 主动语态变被动语态 I have told the children many times not to skate on the pond.急 英语主动变被动I saw him playing football at that moment. 如何变被动 怎样变被动为主动 被动语态变主动语态怎么变 被动语态主动变被动情况,什么时候不用被动语态, 主动变被动We have a class meeting every Monday帮帮忙 被动变主动.I was helped to finished the work by Mary.翻译意思.然后.改成主动语态. 主动语态变被动语态练习题 被动语态怎样变主动语态? 主动语态怎么变被动语态 改主动变被动：Last night I had read a novel.when the bell rang. I have finished my homework.变被动语态 I have had it.怎么变被动语态急 I must have my car repaired怎么变被动 主动语态转化被动语态.I have been to america twice.