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must be cleaned
be+done
be+动词的过去分词
一般现在时的被动语态结构：be(am/is/are)+done
一般过去时的被动语态结构：be(was/were)+done
一般将来时的被动语态结构：will be/be going to be+done
含情态动词的被动语态结构：情态动词+be+done
Mo Yuan writes many local novels.
Many local novels are written by Mo Yuan.
Jenny must babysit her sister on weekends.
Jenny's sister must be babysat (by her) on weekends.
宾变主;
谓变被;
主变宾，by相连;
状不变。
Brother bought me a cool watch for my birthday.
I was bought a cool watch for my birthday (by my brother).
A cool watch was bought (for me) for my birthday (by my brother).
Tom will send his pen pal Jack an e-mail.
Tom's pen pal Jack will be sent an e-mail (by him).
An e-mail will be sent by Tom to his pen pal Jack.
当直接宾语作被动语态的主语时，根据谓语动词的使用习惯分两种情况：
①谓语动词为及物动词buy,make,find,get,draw等时，间接宾语之前接for。
②谓语动词为及物动词give,send,take,bring,teach,show,pass等时，间接宾语之前接to。
The door is closed.
The flowers are inserted in the vase.
不知或不必要说明动作的执行者(只强调动作的承受者)
使用条件：
固定使用被动语态
客观说明时