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1. 不知道動作的執行者時。如：

This house was built two years ago.

2. 不必提出動作的執行者。如：

The old machine has already been repaired.

3. 強調動作的承受者。如：

The little girl is liked by everyone.

1. 一般現在時：am/is/are + 及物動詞的過去分詞。如：

① We should study English well because it _______ widely around the world.

A. is speaking     B. speaks      C. is spoken    D. was spoken

② Maria _______ at 6:30 every morning by her mother to get ready for school.

A. was woken up   B. woke up    C. wakes up    D. is woken up

2. 一般過去時：was/were + 及物動詞的過去分詞。如：

③ After the teacher, Tan Qianqiu’s story _______ on CCTV, many people are learning from him.

A. was reporting   B. was reported  C. reported     D. has reported

3. 現在完成時：has/have + been + 及物動詞的過去分詞。如：

④ The Olympic Park has already _______ in Beijing.

A. built           B. building     C. been built    D. to be built

4. 一般將來時：shall/will + be + 及物動詞的過去分詞。如：

⑤ The meeting _______ in Shanghai this coming Saturday.

A. has been held    B. was held     C. will hold    D. will be held

⑥ More than two schools _______ in the city next year.

A. are built        B. will be built    C. have built   D. were built

5. 含情態動詞的被動語態：情態動詞 + be + 及物動詞的過去分詞。其中的be不能再作任何變化了。如：

⑦ Old people must _______.

A. be spoken to politely  B. speak to polite  C. be spoken politely  D. speak polite

⑧ Food and drink should _______ to bring into the reading room.

A. allow              B. allowed        C. not be allowed     D. not be allowing

    (Keys: 1―8 CDBCDBAC)

首先將主動語態的賓語變為被動語態的主語，然后將謂語變為被動語態，最后將主動語態中的主語放在介詞by的后面。如：

A lot of people speak English. →English is spoken by a lot of people.

在將主動語態變為被動語態時，要注意以下幾點：

1. 含有雙賓語的主動語態在變被動語態時，通常將指人的間接賓語變為被動語態的主語；也可將指物的直接賓語作為被動語態度的主語，但應在間接賓語前加上介詞to(謂語動詞多為pass, give, teach, bring, send, show, write等) 或for (謂語動詞多為buy, make, draw, keep等)。如：

His aunt gave him a nice present yesterday.

→He was given a nice present by his aunt yesterday./A nice present was given to him by his aunt yesterday.

2. 感觀動詞或使役動詞在主動句中其后的動詞不定式不帶to，但在變為被動語態時必須使用to。如：

I often hear Mary sing in the next room. →Mary is often heard to sing in the next room. 

3. 動詞短語(“動詞 + 介詞”、“動詞 + 副詞”等)作謂語的主動句在變為被動句時，要注意不要遺漏動詞后面的介詞或副詞。如：

We should take care good care of the old. →The old should be taken good care of.