`->` Tom has played the piano since he was in Class 4.

`+` Cấu trúc :

`-` S + began + V-ing / to V-inf + thời gian trong quá khứ

`->` S + have / has + V`3`/ed + for / since + thời gian trong quá khứ.

$#Ribee$

Tom has played the piano since he was in Class `4`.

- S + started/began + to V/V-ing + O + when/in/on/at/ago...

= S + has/have + Vpp + O + for/since + ...

- Tom đã chơi piano từ khi anh ấy còn học lớp `4`.

- when -> since + mốc thời gian