46​. Mary ring hours and hours ago → It's hours since Mary rang.
47​. It is ages since Alan visited his parents → Alan visited his parents ages ago.
48​. John has not had his hair cut for over six months → John hasn't had his hair cut for over six months.
49​. I haven't been to HCM city for 2 years → The last time I was in HCM city was 2 years ago.
50​. She hasn't written to us since last year → The last time she wrote to us was last year.
51​. She started to learn English 8 years ago → It's been 8 years since she started to learn English.
52​. He hasn't laughed so much for ages → It's been ages since he laughed so much.
53​. I haven't enjoyed myself so much for years → It's been years since I enjoyed myself so much.
54​. The telephone rang for hours → It's been hours since the telephone rang.
55​. I haven't seen him for ages → It's been ages since I saw him.
56​. Lys father started to stop smoking last year → Lys's father started to stop smoking last year.
57​. The editor hasn't written to Mai for a month → The editor last wrote to Mai a month ago