He has been collecting stamps for five years => He started............

$\text{1,He has been collecting stamp for five years.}$

$\text{=> He started collecting stamp five years ago.}$

$\text{S + started / began + V-ing / to-V = S + have PII / have been + V-ing}$
$\text{(Bắt đầu làm việc gì / Làm việc gì được bao lâu)}$

XIN HAY NHẤT ^^