simple past tense

Subject + the second form of the verb.

Examples:

I walk - I walked

you study - you studied

we cook - we cooked

They play - they played

It is formed by "did" followed by subject and the first form of the verb.

Example

Did I walk?

Did you study?

Did we cook?

Did they play?

Is it formed by the subject followed by "did not" and first form of the verb.

Example

I did not walk.

you did not study.

We did not cook.

They did not play.