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10. Đáp án: How long has he had it? 
Cấu trúc:

When did + S + \(\left[ \begin{array}{l}start/ begin + to V / Ving \\Vo\end{array} \right.\) ? 
-> How long + \(\left[ \begin{array}{l}have\\has\end{array} \right.\) + S + Vp2?

11. Đáp án: It's 6 months since I last saw my grandmother. 
Cấu trúc: 

S + \(\left[ \begin{array}{l}have\\has\end{array} \right.\) + not + Vp2  for .......

→ It's ........ since + S + last + Vp 

12. Đáp án: The last time Tonny took a bath was on Monday. 
Cấu trúc: 

S + \(\left[ \begin{array}{l}have\\has\end{array} \right.\) + not + Vp2 since....... 

→ The last time + S + Vp + was ........

`10.` How long has he had it?

`->` When + did + S + V-bare?

`=` How long + have/has + S + P2?

`11.` The last time I saw my grandmother was `6` months ago.

`->` S + have/has not + P2 + for + time

`=` The last time + S + Ved/V2 + was + time + ago

`12.` It's in Monday since Tonny last took a bath.

`->` S + have/has not + P2 + since + time

`=` It's + in + time + since + S + last + Ved/V2