关于被动语态和主动语态.主动改被动：They are doing the project now.正确是：The project is being done by them now.为什么要加个being?Tom has cleaned the room.正确的是：The room has been cleaned by Tom.为什么要加个been?被动改主动：The house was built in 1990.正确的是：People built the house in 1990.为什么不用加个were在built前面?Things are stolen from the supermaket everyday.正确的是：People steal thing from the supermarket everyday.为什么要这么改?The question is being discussed by a group of students.正确的是：A group of students
关于被动语态和主动语态.
主动改被动：
They are doing the project now.
正确是：The project is being done by them now.
为什么要加个being?
Tom has cleaned the room.
正确的是：The room has been cleaned by Tom.
为什么要加个been?
被动改主动：
The house was built in 1990.
正确的是：People built the house in 1990.
为什么不用加个were在built前面?
Things are stolen from the supermaket everyday.
正确的是：People steal thing from the supermarket everyday.
为什么要这么改?
The question is being discussed by a group of students.
正确的是：A group of students is discussing the question.
同上的问题.
请用比较白化的话来回答,英语里的术语看着混乱.
希望回答完以后能够出几道类似的题目让我改改喔,谢谢大家.
您好.恕我冒昧,我觉得您不太清楚,也分不太清主动语态和被动语态.
如果你做一件事或对一个物体做一件事,你就是主动的,这件事或这个物就是被动的.
在分清了主动和被动语态的问题之后,你的被动改主动的问题就应该迎刃而解了.
而主动改被动,不论一个句子怎么改,原意和时态都是要保留的,这也是为什么主动改被动要加个being或been等等.
希望可以帮到你
被动语态（一般现在时） 主动语态变被动语态时,主动语态句中的宾语变成被动语态句中的主语,主动语态句中的主语成为被动语态句中的动作的发出者.1.一般现在时 is\am\are+P.P(过去分词) 2.一般过去时 was\were+P.P 3....