1. He started working in HCM city in 2000.

->He has....

2. They began reading this comic two hours ago.

->They have....

3. Huong has played chess for 3 hours.

Huong started....

4. We have drunk beer since 7 p.m

We began.....

5. How long have you learnt English?

When did....

6. How long has she cleaned the floor?

When did.........

`1` .He has worked in HCM cituy since 2000

`->` since `+` mốc thời gian `->` HTHT

`->` Cấu trúc HTHT : `(+)` S `+` have/has `+` V3/-ed

`2` .They have read this comic for two hours

`->` for `+` khoảng thời gian `->` HTHT

`->` Cấu trúc HTHT : `(+)` S `+` have/has `+` V3/-ed

`3` .Huong started playing chess 3 hours ago 

`->` ago `->` QKĐ

`->` Cấu trúc QKĐ : `(+)` S `+` V2/-ed

`->` start `+` V-ing : bắt đầu làm gì

`4` .We began drinking beer at 7 p.m 

`->` begin `+` V-ing : bắt đầu làm gì

`5` .When did you start learning English `?`

`->` Cấu trúc QKĐ : `(?)` wh-word `+` did `+` S `+` V

`->` start `+` V-ing : bắt đầu làm gì

`6` .When did she start cleaning the floor `?`

`->` Cấu trúc QKĐ : `(?)` wh-word `+` did `+` S `+` V

`->` start `+` V-ing : bắt đầu làm gì

`1.` He has worked in HCM city since 2000.

- S + started/began + V-ing/to V + in + năm (thời gian trong quá khứ)

-> S + have/has + V3/ed + since + mốc thời gian

`2.` They have read this comic for two hours.

- S + started/began + V-ing/to V + time (thời gian trong quá khứ) + ago

-> S + have/has + V3/ed + for + khoảng thời gian

`3.` Huong started playing chess 3 hours ago.

- Tương tự câu 2

`4.` We began drinking beer at 7 p.m.

- S + have/has + V3/ed + since + mốc thời gian

-> S + started/began + V-ing/to V + at + giờ

`5.` When did you learn English?

- How long + have/has + S + V3/ed?

-> When + did + S + V(bare)?

`6.` When did she clean the floor?

- Tương tự câu 5