`2` .He has started to learn English for 8 years

`->` start `+` to V : bắt đầu làm gì

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

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

`3` .We began learning English one year ago

`->` ago `->` QKĐ

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

`->` begin `+` V-ing : bắt đầu làm gì 

`4` .I studied business administration 2 years ago 

`->` ago `->` QKĐ

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

`5` .We have started working on this project for a year 

`->` start `+` V-ing : bắt đầu làm gì

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

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

`2.` He has been learning English for eight years.

`@` Cấu trúc: S + started to + V (nguyên thể) + thời gian + ago.

↔ Cấu trúc: S + has/have + been + V-ing + for + thời gian.

`3.` We began learning English one year ago.

`@` Cấu trúc: S + has/have + been + V-ing + for + thời gian.
↔  S + began + V-ing + thời gian + ago.

`4.` I began studying business administration in London 2 years ago.

`@` S + has/have + been + V-ing + for + thời gian.

↔  S + began + V-ing + thời gian + ago.

`5.` We have been working on this project for a year.

`@` Cấu trúc: S + started + V-ing + thời gian + ago.

↔ S + has/have + been + V-ing + for + thời gian.

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