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3.一般将来时和现在完成时的被动语态。
复习难点:
1.被动语态中be形的确定；
2.主动语态中省略to的宾补在被动语态中须补上to.
基础知识回顾
1、观察结构
执行者 + 动词+承受者
Workers make cars in this factory.
主 谓 宾
承受者 + be+动词过去分词 +(by +执行者)
Cars are made (by workers) in this factory.
主 谓
2、总结概念：
谓语动词的执行者作主语，用主动语态。
谓语动词的承受者作主语，用被动语态。
分类与构成
4. 用法：
a. 当不知道谁是动作的执行者时；
b. 没有必要或不想指出谁是动作的执行者时；
c. 只需强调动作的承受者时。
She waters the flowers every day.
The flowers
every day.
are watered
by her
The students planted many trees in 2006.
Many trees were planted by the students in 2006 .
My daughter will feed the ducks.
The ducks will be fed (by my daughter) tomorrow.
.