Question

Answer 1

18 It is 2 months since he last wrote to me

19 The last time it rained was 2 months ago

20 It's three years since she last heard that song

21 I haven't seen her for 2 years

22 I haven't seen David since 1995

Answer 2

18. It is two months since he wrote to me.
19. The last time it rained was two months ago.
20. I haven't seen her for the past two years.
21. I haven't seen David since 1995.