she started working as a secretary 2 hours ago.
⇒ She has worked as a secretary for 2 hours .
⇒ She has been working as a secretary for 2 hours .
* Cấu trúc:
S + started / began + V-ing / to-V = S + have/has + PII / have/has + been + V-ing
(Bắt đầu làm việc gì / Làm việc gì được bao lâu)
Chúc bạn học tốt ~
# Yumi