PAST SIMPLE
We can use past simple to talk or discuss about the inmediate past (something that happened before) or something that happened several times in the past.

Regular verbs
The regular verbs are formed by the base form of the verb + ed
EXAMPLE
Baked

As every tense past simple has its positive, negative and interrogative form.
And each one is meant for a different meaning.

NEGATIVE FORM

Pronoun+ didn´t or did not + base form of the verb+ complement

You didn´t call the whole week