(1)把主動(dòng)語態(tài)的賓語變?yōu)楸粍?dòng)語態(tài)的主語。

(2)把謂語變成被動(dòng)結(jié)構(gòu)(be+過去分詞) (根據(jù)被動(dòng)語態(tài)句子里的主語的人稱和數(shù)，以及原來主動(dòng)語態(tài)句子中動(dòng)詞的時(shí)態(tài)來決定be的形式)。

(3)把主動(dòng)語態(tài)中的主語放在介詞by之后作賓語，將主格改為賓格。例如：

All the people laughed at him.

He was laughed at by all people.

They make the bikes in the factory.

The bikes are made by them in the factory.

He cut down a tree.

A tree was cut down by him.

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