1 A fish was eaten by the cat

2 thier old grandparents are looked after

3 a nice girl was seen at the party last night

4 Are toys liked by you?

5.Milk is drank by us every morning

6 the floor is being cleaned now

7 the problem will be solved soon

8 our homework is being done at the moment

9 Was your lesson being learnt/learned at 7pm last night?

10 their work has just been finished

11 the tree is being planted in the garden by her father now

12 a small house has just been built here by the builders

13  the book was written by that famous author

14 you will be helped by your teacher

15 a rat is being chased by my cat

16  we are taught english by Mr Nguyen

17 the lesson is being explained by Ms Hoa now

18 a big hole was dug in the yard by her brother 

19 Milk will be made by the waitress

20 A small package was sent to me last week

Answer :

1 A fish was eaten by the cat

2 thier old grandparents are looked after

3 a nice girl was seen at the party last night

4 Are toys liked by you?

5.Milk is drank by us every morning

6 the floor is being cleaned now

7 the problem will be solved soon

8 our homework is being done at the moment

9 Was your lesson being learnt/learned at 7pm last night?

10 their work has just been finished

11 the tree is being planted in the garden by her father now

12 a small house has just been built here by the builders

13  the book was written by that famous author

14 you will be helped by your teacher

15 a rat is being chased by my cat

16  we are taught english by Mr Nguyen

17 the lesson is being explained by Ms Hoa now

18 a big hole was dug in the yard by her brother 

19 Milk will be made by the waitress

20 A small package was sent to me last week

Good luck !