+1
Hey, What's the difference between those 2?

Thanks.

-Tomer.
+1
I was busy-- the speaker is no longer busy at all.
I have been busy-- the speaker is still busy or was so until very recently.
+1
...----- busy ----- busy ----- busy ----- busy -----|NOW|
I've been busy.

.....[ busy ] ...................................................... |NOW|
I was busy.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Comments  
Thank you.

Tomer
 CalifJim's reply was promoted to an answer.
Teachers: We supply a list of EFL job vacancies

In sentence....I have been busy. What part of speech is busy? Have been usually takes a verb with and ing ending, but in this case, I have no clue how to classify busy.