Completed actions in the past at a specific time in the past.
Often used with a time expression: yesterday, last week, two days ago, etc.
Verb +ed : I walked home yesterday.
2nd row irregular verbs: I went to the cinema last week.
Negate and questions:
I didn’t do the homework. (we add didn’t, the verb doesn’t change)
Did you go to the cinema? (We add did, the verb doesn’t change)