Dưới đây là các câu đã được viết lại theo yêu cầu:

18. I last saw him when I was a student.
→ I haven’t seen him since I was a student.

19. I haven’t seen him since 1985.
→ The last time I saw him was in 1985.

20. I last read a book on September 20.
→ I haven’t read a book since September 20.

21. He hasn't laughed so much for ages.
→ It’s ages since he last laughed.

22. I've never seen that play before.
→ It's the first time I've seen that play.

23. John last sent me a letter when he was in New York.
→ The last time he sent me a letter was when he was in New York.

24. This is the first time I have heard her sing.
→ I haven’t heard her sing before.

25. I haven't worn that shirt since May.
→ I last wore that shirt in May.