43/ The girl who is Mary is sitting by Jack.

44/ Can you understand that question which he asked you last time.

45/ Is that the girl whom we saw on TV last night?

46/ The farm which we visited last Sunday produces milk.

47/ At last he married the girl whom he loved.

48/ The man whose daughter we play with every day is an engineer.

49/ He didn't receive the letter which sent him last January.

50/ He often tells me something about his village where he was born.

51/ The children like the funny stories which their grandmother tell them every evening.

52/ Jack London who wrote " Iron heel" is a famous American writer.

43. The girl who is sitting by Jack is Mary.

44. Can you understand the question which he asked you last time?

45. Is that the girl whom we saw on TV last night?

46. The farm which we visited last Sunday produces milk.

47. At last he married the girl whom he loved.

48. The man is an engineer, whose daughter we play with every day. 

49. He didn't receive the letter which I sent him last January.

50. He often tells me about his village where he was born.

51. The children like the funny stories that their grandmother tells them every evening.

52. Jack London, who wrote "Iron Heel", is a famous American writer.

53. whom → who