16.Who look after the childen for you?

->who are you looked after the children?

17. How long have they waited for the doctor?

->How long has the doctor been waited for?

18. What time can the boys hand in their papers?

->What time can the boys' papers be handed in?

19. Why didn't they help him?

->why wasn't he helped?

20. Who are they keeping in the kitchen?

->who is being kept in the kitchen?

30.The children looked at the women with a red hat

->The woman with a red hat was looked by the children.

31, She used to pull my hat over my eyes.

-> My hat used to be pulled over my eyes by her

32. For the past years, I havedone all my washing by hand.

- >For the past years, all my washing by hand has been done

33, A pair of robins has biult a nest in the porch since last week.

-> A nest has been built in the porch by a pair of robins last week

34, The police haven't found the murderer yet.

-> The murderer hasn't been found by the police yet

35, The sold one of her own painings at $1,000.

-> One of her own paintings was sold at $1,000

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