$\text{1. The last time I went to a concert was the last year}$

$\text{Cấu trúc thì HTHT → thì QKĐ ⇒ The last time ....... → S + hasn't/ haven't .........}$

$\text{2. I haven't really enjoyed myself since your birthday}$

$\text{The last time ..... ago = S + haven't/ hasn't + ......... + since + ...... }$

$\text{3. My father hasn't seen your brother for nearly 20 years}$

$\text{It's ............ since + ........ ⇒ S + .............. for + khoảng tg}$

$\text{4. How long is it been since you learnt to drive?}$

$\text{When did you ......... ⇒ How long is it since .............}$

$\text{5. I haven't gone swimming since we were in Spanish}$

$\text{Giống cấu trúc ở câu 2}$