Question

把下列句子改为被动语态:

1、The mechanic repaired the bicycle yesterday.
2、Mike invites Lucy to his birthday party.
3、The clean the house once a week.

Answer 1

1、The bicycle was repaired by the mechanic yesterday.
2、Lucy is invited by Mike to his birthday party.
3、The house is cleaned (by them) once a week.
变被动语态的话，要将原来的宾语变为主语，将谓语动词变为be动词加过去分词的形式，然后再将原来的主语变为by加上宾格的形式接在谓语后面（有时可以不加），最后在修改其他成分。

Answer 2

被动语态其实很简单就是Be+动词的过去分词 Be要随着时态/人称的变化而变化,看下面答案自己体会吧
1 The bicycle was repaired by the mechanic yesterday.
2 Lucy is invited to Mike's birthday party.
3 The house is cleaned once a week.(这一句原句有问题 第一个the后掉了个单词 不过不是很影响)

Answer 3

The bicycle was repaired by the mechanic yesterday.
Lucy is invited by Mike to his birthday party.
The house is cleaned (by them) once a week.