"I HAVE WORKED FOR THIS COMPANY BEFORE." "I HAVE BEEN WORKING FOR THIS COMPANY FOR THREE YEARS NOW."

•I have worked in … (I once worked in …, but now I left. I don’t work work there anymore) • I have been working I am still working in the company and I have been working in this company for 2 weeks (for+ a period of time )

"I HAVE WORKED " - a more recent, completed action. "I HAVE BEEN WORKING " - an ongoing action.