This is The simple Past tense, The basic one in Grammar.
In the 3 simple tenses(past,present,future), things are like this:Present(things happening): eat
Most past tenses add "ed" to it (walk-walked) Some on the other hand change y to ied (dry-dried) some don't even have one. they are not regular verbs (fly-flew)
Simple Past are:
Things which DO NOT continue into the future
Things which end in the past
Things who are unreal (stories,fairy tales)
this is an example:I broke the window.
Notice! if there is a do and a verb, change do to did, DO NOT change the verb!