Question

将下列句子改为被动语态

1he plants flowers every year
2 we speak chinese
3i look after the old man
4i worte a letter yesterday
5did they build this bridge last year
6they asked us to sing a song
7should i open the door
8wu must plant trees every year
9mary wii sweep the floor
10will tom clean his room
11mary is going to wash the dishes
12 tom has cleaned his room
13they have pleanted a lot of trees since 1990
14how many books have you sold out so far
15are you using your knife
16tom is not reading a book
17he gave me a book yesterday
18i found him playing in the park

Answer 1

我先告诉你变被动语态的一般方法吧：第一步，将原句的宾语放到句首，第二步，按照原句的时态，再结合新的主语，将谓语动词变为be done形式，第三步，用by连接原句的主语放在句尾，如果原句主语为人称代词，还必须改为宾格形式，因为by是介词。
但是具体有些需要注意的点，所以我帮你都改好吧：
1 Flowers are planted by him every year.
2 Chinese is spoken by us.
3 The old man was looked after by me.
4 A letter was written by me yesterday.
5 Was this bridge build by them last year?
6 We were asked to sing a song by them.
7 Should the door be opened by me?
8 Trees must be planted by us every year.
9 The floor will be swept by Mary.
10 Will Tom's room be cleaned by himself?
11 The dishes are going to be washed by Mary.
12 Tom's room has been cleaned by himself.
13 A lot of trees have been planted by them since 1980.
14 How many books have been sold out by y ou so far?
15 Is your knife being used by you?
16 A book is not being reading by Tom.
17 A book was given to me by him yesterday.
18 He was found playing by me in the park.

Answer 2

1.Flowers are planted ( by him )every year.
2.Chinese is spoken by us .
3.The old man is looked after by me .
4.A letter was written ( by me )yesterday .
5.Was this bridge built ( by them ) last year ?
6.We were asked (by them )to sing a song .
7.Should the door be opened ?
8.Trees must be planted every year .
9.The floor will be swept by Mary .
10.Will his room be cleaned by Tom ?
11.The dishes are going to be washed by Mary .
12.His room has been cleaned by Tom .
13.A lot of trees have been planted (by them )since 1990 .
14.How many books have been sold out so far ?
15.Is your knife being used ?
16.A book is not being read by Tom .
17.I was given a book yesterday .
18.He was found playing in the park .

Answer 3

Flowers are planted by him every year.
Chinese is spoken by us.
The old man is looked after by me.
A letter was written by me yesterday.
Was this bridge bulit by them last year?
We were asked to sing a song by them.
Should the door be opened by me?
Trees must be planted by us every year.
The floor will be swept by Mary.
Will his room be cleaned by Tom?
The dishes is going to be washed by Mary.
His room has been cleaned by Tom.
A lot of trees have been planted since 1990 by them.
How many books have been sold out by you so far?
Is your knife being used by you?
A book isn't being read by Tom.
A book was given to me by him yesterday.
He was found playing in the park.
好累，多加点分啊！

老师祝你学习进步！
望采纳，多谢！^_^