Cấu trúc chung từ câu `  1 `  ` -> `  `  3 ` 

S + started / began + V-ing / to V + when + S + V-ed / V2

` = `  S + have / has + VPII + since + 1 mốc TG

Hoặc

S + started / began + V-ing / to V + 1 khoảng TG + ago

` = `  S + have / has + VPII + for + 1 khoảng TG

` 1 ` : They have lived in Ho Chi Minh city for 2 years

` 2 ` : Nam has played the guitar since 4pm

` 3 `  : I have learnt English since i was 5 years ago

`4 `  : My father is interested in watching sports

` - ` S + like /likes + V-ing /N

` = `S +be + interested in + V-ing / N

` 5 ` : Hoa is interested in reading comics

` - `S +be + interested in + V-ing / N

` = ` S + enjoy / enjoys + V-ing /N

`1` They have lived in Ho Chi Minh city for 2 years

`2` Nam has played the guitar since 4pm

`3` I have learnt English since i was 5 years ago

Giải thích

Cấu trúc chung cho cả bài

Cấu trúc :  S + started / began + V-ing / to-V

`->` Cấu trúc :  S + have PII / have been + V-ing  

`--------------`

`4`

`->` My father is keen on watching sports

`->` My father is interested in watching sports

`5`

`->` Hoa is keen on reading comics

`->` Hoa is interested in reading comics

Giải thích

Cấu trúc chung cho cả bài 

Cấu trúc : S + like + V_ing

`->` Cấu trúc : S + be keen on + V_ing

`->` Cấu trúc : S + be interested in + V_ing