How we use past perfect and past form?

Answer 1

past form is only a main verb but in the past, example i walked. past perfect is when you use had+past participle of a main verb,example i had walked.

Answer 2

We use the past perfect to show that an action happened before another action in the past. It is formed by combining "had" with the past participle of the verb (e.g. had gone). The past simple is used to talk about a completed action in the past at a specific time.