.....................................................

74. The last time I was to HCM city was 2 years ago.

(The last time + S + V-ed/P-II + was + mốc thời gian: lần cuối cùng làm gì là khi nào)

75. It is the first time I have met such a famous person before.

(It is the first time + S + have/has + V-ed/V-PII: lần đầu làm gì)

76. It is the first time she has seen that boy here.

(It is the first time + S + have/has + V-ed/V-PII: lần đầu làm gì)

77. The last time she wrote to us was last year.

(The last time + S + V-ed/P-II + was + mốc thời gian: lần cuối cùng làm gì là khi nào)

78.  It's 8 years since she started to learn.

(It is + thời gian + since + S + V-ed/P-II)

79. It's so much ages since he laughed.

(It is + thời gian + since + S + V-ed/P-II)

80. It's years since I enjoyed myself.

(It is + thời gian + since + S + V-ed/P-II)

81. It's hours since the telephone rang.

(It is + thời gian + since + S + V-ed/P-II)

__

Note: quy ước từ bài làm

Cách đổi từ thì HTHT sang thì QKĐ (và ngược lại):

`(+-)` S + have/has + (not) + V-ed/V-PII + for + thời gian

`->` S + HTHT (phủ định) + for + thời gian.

`(+-)` S + have/has + (not) + V-ed/V-PII + before.

`->` The last time + S + V-ed/P-II + was + mốc thời gian

`(+)` S + have/has + V-ed/V-PII + for + thời gian

`->` S + started + V-ing + thời gian + ago