``` 53. I have never been to the seaside before. 54. John and Mary moved to California two years ago. 55. The police started looking for him two months ago. 56. I have never seen this dangerous dog before. 57. Mary rang many hours ago. 58. It is many years since Alan last visited his parents. 59. John hasn't been to England for 6 months. 60. I have never seen such a beautiful building before. 61. I have never read such a romantic story before. 62. This is the first time they have gone skiing in Nepal. 63. I haven't played football since 2000. 64. I haven't been to HCM city for 2 years. 65. I've never met such a famous person before. ```

đây là bài  tập chuyên để biến đổi QKĐ-HTHT 
làm mấy câu mình đánh dấu tích thôi nhé mình chấm luôn
----- Nội dung ảnh -----
```
53. I have never been to the seaside before.
54. John and Mary moved to California two years ago.
55. The police started looking for him two months ago.
56. I have never seen this dangerous dog before.
57. Mary rang many hours ago.
58. It is many years since Alan last visited his parents.
59. John hasn't been to England for 6 months.
60. I have never seen such a beautiful building before.
61. I have never read such a romantic story before.
62. This is the first time they have gone skiing in Nepal.
63. I haven't played football since 2000.
64. I haven't been to HCM city for 2 years.
65. I've never met such a famous person before.
```