54. I had my last hair cut two years ago. (SINCE) Its two months _________________________________ my hair cut.

( Sửa : two years `->` two months )

54. It's two months since I last had my hair.

- S + V2/ed + ( was ) + time trong QK

`=` It + tobe + time + since + S + last + V ( QKĐ ) : đã bao lâu từ khi lần cuối làm gì

- Đã hai tháng kể từ lần cuối tôi để tóc.