51. The bed which I sleep on has no mattress.

52. There wasn't any directory in the telephone box from which I was phoning.

53. The chair which I was sitting on was suddenly collapsed.

54. Mr Smith said " I am too busy to speak to you and you have come especially to see me"

55. I saw several homes, most of which were quite unsuitable.

56. The office which Graham took us to was filled with books.

57. Mr Marks is unhappy because the stream flows across his farm. 

58. They picked up five boat-loads of refugees, some of which had at sea for several months.

59. The people who were speaking to these people didn't know French.

Chúc học tốt

Xin hay nhất, tks!!

51. The bed on which I sleep has no mattress.

52. There wasn't any directory in the telephone box from which I was phoning.

53. The chair on which I was sitting suddenly collapsed.

54. Mr. Smith whom I had come specially to see said he was too busy to speak to me.

55. I saw several houses, most of which were quite unsuitable.

56. The office to which Graham took us was filled with books.

57. Mr.Mark, whose farm the steams flow across , is unhappy about the plans for the new dam.

58. They picked up five boat-loads of refugees, some of which had been at sea for several months.

59. The people to whom he was speaking didn't know French.

Câu rút gọn sử dụng mệnh đề quan hệ:

whom - chỉ người

which: chỉ vật

whose + danh từ: chỉ vật sở hữu của chủ thể đó