giups vs mấy ní ưiiiiiiiiiiiii

10. The last time Lucy wore that dress was when Barbara's wedding.

`-` The last time + S + V2/ed + O + was + when + clause : Lần cuối

16. It's hours and hours since Mary rang.

`-` It's + time + since + S + V2/ed

17. Tom has been ill for three days.

`-` HTHT : (`+`) S + have/has + V3/ed.

18. She left university 2 year ago.

`-` QKĐ : (`+`) S + V2/ed + O

19. This is the most delicious cake I have tasted in my life.

`-` It's + so sánh hơn nhất + danh từ + S + have/has + V3/ed

20. When did you see Mary?

`-` QKĐ : (`?`) When + did + S + V_inf?