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be + 过去分词(PP) + (by …)
am/is/are + pp
was (were) + pp
will (shall) /be going to + be + pp
must (can, have to, may等) + be + pp
have/has been +pp
在改写中应注意:
1.把原来的宾语提到前面作被动语态的主语;
2.把动词变成“be + 过去分词”;
3.主动语态中的主语变为介词by的宾语。
4.遵循时态不变的原则
变化过程例1 将下列句子改为被动语态。 We clean our classroom every day. Our classroom is cleaned (by us) every day.
一般现在时的被动语态:
am/is/are + 过去分词
People play football all over the world.
2. Mr. Green teaches us this term.
Football all over
the world.
We this term.
is played
are taught by Mr. Green
(by people)
一般过去时的被动语态:
was/were + 过去分词
3. People built the Great Wall long ago.
4. Two years ago we used the machinesto make shoes for children.
The Great Wall