英语中主动变被动的方法

1.把宾语当做主语，放到句首。
2.把原来的谓语改成be+过去分词的形式。（be要随时态和人称进行变化）
3.把原来的主语放到句末，并在前面加上一个介词by。
例如：
1.I ate three bananas yetserday.
2.She can cook dishes.
3.He gave me a new dress last week.
被动句：
1.Three bananas were eaten by me yesterday.
2.Dishes can be cooked by her.
3.
(1)I was given a new dress by him last week.
(2)A new dress was given to me by him last week.

如果你现在上初中，只需掌握谓语动词的主动变被动。在需要变被动的谓语动词前面加上be动词，根据主语的形式来确定be动词形式。比如The students，是复数，be动词形式就是are或were,然后就要变谓语动词了，比如是teach，那就要变成过去分词形式，就是taught。举例：学生们被老师教，The students are taught by teacher.如果说，学生们昨天被老师教，The students were taught by teacher yesterday.注意，be动词要根据人称和时态变化，然后就是谓语动词变成过去分词就行了。再举例：The car is repaired by him.就是只现在。The car was repaired by him.就是指过去车被修过了。

主动就是正常语序：
eg：I answer your question.
被动就是倒装语序：
eg：Your question is answered by me.
注意动词要用过去时就可以了