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Hey, What's the difference between those 2?

Thanks.

-Tomer.
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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.
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...----- busy ----- busy ----- busy ----- busy -----|NOW|
I've been busy.

.....[ busy ] ...................................................... |NOW|
I was busy.
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Thank you.

Tomer
 CalifJim's reply was promoted to an answer.
Students: Are you brave enough to let our tutors analyse your pronunciation?

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.

ESL 4 VIPKID I have been busy

'busy' is an adjective.

I .......... am .......... busy.
I .......... was ......... busy.
I ........will be ....... busy.
I ..... may be ....... busy.
I ..... might be .... busy.
I ... have been ... busy.
I .... had been .... busy.
I could have been busy.

It doesn't matter what tense be is in or what auxiliary verbs occur before it. The adjective at the end remains an adjective. Here 'have been' takes the role of a main verb.

The cases where a present or past participle of a verb follows are the cases where 'have been' has the role of an auxiliary group.

I .......... am ........ writing a letter.
I .......... was ...... taking an exam.
I ....... will be .... deciding that matter later.

I ............. may be ......... contacted at 555-1234.
I .......... have been ...... awarded a prize.
I .. could have been .. mistaken for someone else.

CJ