$\color{black}{1}$

→ It takes Minh two hours to do his homework every day

S + Spend + Time + Ving

→ It takes/Took + time + to do something

$\color{black}{2}$

→ He has learned For 10 years

S + Started/Began + V/Ving +.....in/ago

⇒ S + Have/Has + V3/Ved + For../Since 

$\color{black}{3}$

→ I haven't seen peter for 6 months

→ I last saw peter 6 months ago

→ It is 6 months since i last saw Peter

S + Hasn't/Haven't + V3/Ved + For/in

S + Last + V2/Ved + ago/in ( 2009)

It is + Time + Since + S + Last + V2/ved

1. It takes Minh 2 hours to do his homework everyday.

-> spend <=> it takes...: Tốn số thgian để lm j đó 

2. He has learned for 10 years 

-> câu đề là thì quá khứ (ago) nên chuyển sang hiện tại hoàn thành.

S + have/has + V3/Ed... +for...(time)

3. He hasn't seen Peter for 6 months.

-> tương tự câu 2. 

Dịch: Anh ấy không thấy Peter trong 6 tháng.