将下列句子变成被动语态

1 Did you write the letter?

2 People use metal for making machines.

3 The wind blew the clouds away.

4 The boss made him work for 10 hours.

5 Do you wash your clothes very often?

6 Mother never lets me watch TV.

7 Jack gave Peter a Christmas prsesnt just now.

8 We saw a lot of stuents playing games on the playground.

9 We heard them sing in  the next room

10 Everyone who heard it laughed at him.

标清题号，答题方法。

1，was the letter written by you?

2, metal is used for making machines by people.

3,the clouds was blown away by the wind.

4, He is made to work for 10 hours by the boss

5, are your clothes washed very often by you?

6, i am never letted  to watch tv by my mother

7,

都对了

但是4.应该用过去式、He was made.....

di 第6句、let过去分词还是let 。

其实BY 谁。一般可以省略、

把原句宾语当做主语、动词用被动、其他照抄、

你看下规律