Affirmative:[VERB+ed] or irregular verbs She washed her car.
Negative : we add Did + not I didn't travel to Korea.
Interrogative: we make inversion Did + Subject+ verb. Did you have dinner last night?
USE 1 Completed Action in the Past
I saw a movie yesterday.
I didn't see a play yesterday.
USE 2 A Series of Completed Actions
I finished work, walked to the beach, and found a nice place to swim.
USE 3 Habits in the Past
Did you play a musical instrument when you were a kid?
She worked at the movie theater after school.
They never went to school, they always skipped class.
Some Practice on the content:
VErb Tense Exercise 3 Simple Past and Past Continuous
Verb Tense Exercise 4 Simple Past and Past Continuous
Verb Tense Exercise 5 Simple Past and Present Perfect
Verb Tense Exercise 6 Simple Past and Present Perfect
Verb Tense Exercise 11 Simple Past and Past Perfect
Verb Tense Exercise 12 Simple Past, Present Perfect, and Past Perfect