1)把主動語態(tài)的賓語變成被動語態(tài)的主語。

2)把主動語態(tài)的謂語變成被動語態(tài)的be + 過去分詞，時態(tài)要與原句保持一致。

3)把主動語態(tài)的主語變?yōu)榻樵~by 的賓語，放在被動語態(tài)里謂語動詞之后，by 短語可以省略。

My aunt invited me to her dinner party.

→I was invited (by my aunt ) to her dinner party.

The school set up a special class to help poor readers.

→A special class to help poor readers was set up in the school.

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