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be关键。
注意:主动语态变为被动语态，其谓语动词的时态要与原句时态保持
一致；谓语动词的数要与新主语保持一致（不及物动词没有被动语态）
如:1.I found the ticket on the floor.
The ticket was found by me on the floor.
2.The students study German in this school.
German is studied by the students in this school.
3.Now people can use computers.
Now computers can be used by people .
His brother washes bowls every day.
主
谓
宾(受动者)
Bowls
are washed
by
his brother
every day.
改为被动语态
Tom cleaned the room just now.
主
谓
宾(受动者)
The room
was cleaned
by
Tom
just now.
He must look after the old man.
主