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IRREGULAR VERBS

We have already studies how the SIMPLE PAST works with the REGULAR VERBS. Now you're going to learn what happens if the verbs are IRREGULAR. First of all you have to study the LIST OF IRREGULAR VERBS.
For example, we know that BUY is an irregular verb because it's on the list.
BUY- BOUGHT

AFFIRMATIVE
I BOUGHT
YOU BOUGHT
HE BOUGHT
SHE BOUGHT
IT BOUGHT
WE BOUGHT
YOU BOUGHT
THEY BOUGHT

NEGATIVE
I DIDN'T BUY
YOU DIDN'T BUY
HE DIDN'T BUY
SHE DIDN'T BUY
IT DIDN'T BUY
WE DIDN'T BUY
YOU DIDN'T BUY
THEY DIDN'T BUY

INTERROGATIVE
DID I BUY?
DID YOU BUY?
DID HE BUY?
DID SHE BUY?
DID IT BUY?
DID WE BUY?
DID YOU BUY?
DID THEY BUY?

If you don't study the IRREGULAR LIST you can't know how to do  negative and interrogative sentences in the right way.