31. She can't speak English, which is a disadvantage.

32. I'm staying with Henry, whose father works in a bank.

33. Do you remember Mrs Lan who taught us History?

34. The museum which our class visited last weekend was built in 1805.

35. The man whom I told you about works in the hospital.

36. Do you like the person who sits next to you?

37. The house which my father bought last year costs a lot of money.

38. We are visiting the children whose parents died in the storm.

39. My sister, who was trained to be a sewer, is rather childish.

40. Colin told me about his new job, which he enjoys very much.

31. She can’t speak English . It is a disadvantage .

=> She can't speak English, which is a disadvantage.

32. I’m staying with Henry . His father works in a bank

=> I'm staying with Henry, whose father works in a bank.

33. Do you remember Mrs Lan ? She taught us History.

=> Do you remember Mrs Lan who taught us History?

34. The museum was built in 1805 . Our class visited it last weekend.

=> The museum which our class visited last weekend was built in 1805.

35. The man works in the hospital . I told you about him .

=> The man whom I told you about works in the hospital.

36. Do you like the person ? The person sits next to you .

=> Do you like the person who sits next to you?

37. The house costs a lot of money . My father bought it last year .

=> The house which my father bought last year costs a lot of money.

38. We are visiting the children . Their parents died in the storm .

=> We are visiting the children whose parents died in the storm.

39. My sister is rather childish . She was trained to be a sewer .

=> My sister, who was trained to be a sewer, is rather childish.

40. Colin told me about his new job . He enjoys it very much .

=> Colin told me about his new job, which he enjoys very much.