Basic American English Grammar - Lesson 5 ( The Past Tense )

There are two types of past tense verbs:

regular verbs: add "ed" to the simple form

irregular verbs: don't add "ed"

Regular Verbs     Irregular Verbs
simple    past    simple    past
work    worked    be    was/were
live    lived    get    got
move    moved    go    went
walk    walked    put    put
open    opened    eat    ate
wait    waited    have     had 

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Be - Past Tense

I was     We were
You were     You were
He was     They were
She was
It was

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To make the negative, use "did" + "not" (didn't) + the main verb in the simple form:
Singular    Plural
I did not learn     We did not learn
You did not learn     You did not learn
He did not learn    They did not learn
She did not learn
It did not learn

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Irregular Verb: Have

Subject + ...........
irregular verbs take  different forms in the past tense 

EXAMPLES
I had     We had
You had     You had
He had     They had
She had
It had