被动语态的一般时态 (Passive Voice in Simple Tense)

1. 一般现在时：am/is/are + 过去分词，如：
　The milk is brought to my door but the letters are left in the hall.
　Large quantities of fuel are used by modern industry.

2. 一般过去时：was/were + 过去分词，如：
　Rome was not built in a day.
　The letters were sent to the company by airmail.

3. 一般将来时：will be + 过去分词，如：
　Oil imports will be increased.
　These dangerous jobs won't be performed by humans before long.

4. 情态动词 + be + 过去分词，如：
　English cannot be learned in class only.
　This dress can't be washed; it must be dry-cleaned.

5. 动词make的宾语后接不带to的不定式，但用被动语态时不定式不省略to，如：
　Mother made her leave the room.
　→　She was made to leave the room by Mother.