(1)把主動語態的賓語變為被動語態的主語。

(2)把謂語變成被動結構(be+過去分詞) (根據被動語態句子里的主語的人稱和數，以及原來主動語態句子中動詞的時態來決定be的形式)。

(3)把主動語態中的主語放在介詞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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