11. I haven't met her for a long time. I didn't................................................................................................................. 12. How long have you learnt French ? How long ago.................................................................................................? 13. How long have you bought this car ? When did............................................................................................? 14. When did you start to listen to classical music ? How long .......................................................................................? 15. I saw her 10 years ago. I haven't..........................................................................................

$\text{11.}$ I didn't meet her a long time ago.

$\text{12.}$ How long ago did you learn French?

$\text{13.}$ When did you buy this car?

$\text{14.}$ How long have you listened to classical music?

$\text{15.}$ I haven't seen her for 10 years.

$\text{— — — — — — — — }$

$\text{৹}$ Cấu trúc Thì HTHT $\Leftrightarrow$ QKĐ

$\text{–}$  S $\text{+}$ have/has $\text{+}$ V(3/ed) $\text{+}$ for/since $\text{+}$ time

$\rightarrow$ S $\text{+}$ V(2/ed) $\text{+}$ time $\text{+}$ ago.

$\rightarrow$ S $\text{+}$ didn't $\text{+}$ V-inf $\text{+}$ time $\text{+}$ ago.

$\text{–}$ How long $\text{+}$ S $\text{+}$ have/has $\text{+}$ V-3/ed $\text{+}$ for/since $\text{+}$ time?

$\rightarrow$ How long ago $\text{+}$ did $\text{+}$ S $\text{+}$ V-inf $\text{+}$ time $\text{+}$ ago.

$\rightarrow$ When did $\text{+}$ S $\text{+}$ V-inf?