如何判断一个英语句子是被动句还是主动句
主动句结构一般是：主语+谓语+宾语 e.g. He is cleaning the classroom.那么被动句就变成：宾语+be+动词ed+(介词+主语) The classroom is cleaned by him.
英语句子主动句变被动句~
急
the policeman was asked for help by the woman.a story is told by the old man on TV on Sunday.is the box ed as a table by them?a collection was sent to me by her last week.math is not taught to by the teacher t term.a hat was bought to her sister by .he is often heard to play the violin at home by .clothes was not washed by the lazy boy yesterday.the kind teacher is listened to by students carefully.when are you taken to the park by your father?
把英语句子翻译为被动句
主动句变被动句被动语态由“be+done”构成。
不同时态的被动语态的差异主要体现在助动词be的变化上，同时be还要在人称和数上与主语保持一致。
在将主动语态变为被动语态时，可按以下三个步骤：a.把主动语态的宾语变为被动语态的主语。
b.把谓语变成被动结构(be＋done)，并根据被动语态句子里的主语的人称和数以及原来主动语态句子中动词的时态来决定be的形式。
c.把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。
在无须说明动作的执行者或只强调动作的承受者时，by短语可以省略。
例如： 1.WespeakChinese.→Chineseisspokenbyus.2.Allthepeoplelaughedathim.→Hewaslaughedatbyallpeople.3.Theymakethebikesinthefactory.→Thebikesaremadebytheminthefactory. 含有双宾语的主动句改为被动句时，应将其中一个宾语改为被动结构的主语，另一个宾语仍保留在原处。
一种情况是把间接宾语(指人)变为主语，直接宾语(指物)不变；另一种情况是把直接宾语(指物)变为主语，间接宾语(指人)不变，这时,间接宾语前通常加介词to，有时加for。
例如： Myfathergavemeanewbookonmybirthday. →Iwasgivenanewbook(bymyfather)onmybirthday.(间接宾语作了主语)→Anewbookwasgiventome(bymyfather)onmybirthday.(直接宾语作了主语)常跟双宾语的动词有：givesb.sth.\\\/givesth.tosb.showsb.sth.\\\/
英文被动句
A:When was your bike stolen?B:Two days ago. A:你的车是什么时候被盗的
B:两天前。
