14. I haven't seen my brother for 14 years

- It has been + khoảng thời gian + since + S + last + V_ed/2 

= S + have/has + not + Vp.p + for + khoảng thời gian

15. It is the first time I have ever seen such a mess in my life

- S + have/has + not/never + Vp.p + (before)

= This/It + is + the first time + S + has/have + Vp.p

16. It's been years since I last went to a cricket match

- It has been + khoảng thời gian + since + S + last + V_ed/2 

= S + have/has + not + Vp.p + for + khoảng thời gian

17. When were Catherine and Henry engaged?

- How long + have/has + S + Vp.p?

= When + did + S + V(inf)?

= When + was/were + S + adj?

18. This is the first time I have ever seen a ditier-looking dog

- S + have/has + not/never + Vp.p + (before)

= This/It + is + the first time + S + has/have + Vp.p

19. It is hours since Mary rang

- S + V_ed/2 + khoảng thời gian + ago

= It is + khoảng thời gian + since + S + V_ed/2

20. This is the first time I have ever tasted such pleasant food

- S + have/has + not/never + Vp.p + (before)

= This/It + is + the first time + S + has/have + Vp.p

21. Neither she nor I have been there before

- Neither + S1 + nor + S2 +V(chia theo S2): cũng không

22. The last time I went to Bristol was 3 years ago

- S + have/has + not + Vp.p + for + khoảng thời gian

= The last time + S + V_ed/2 + was + khoảng thời gian