The past perfect simple tense is formed by using the auxiliary verb had together with the V3 (past participle). The V3 (past participle) form of a regular verb looks just like a regular verb in the past simple: walk > walk ed / study > stud ied / stop > stop ped / create > creat ed. There are quite a few irregular verbs in English though.

Do you ever use the PAST PERFECT TENSE (“I had worked”)? Do you know this advanced tense can help you talk about the past in a special way? In this English g

The present perfect is formed with subject + have + past participle. "I am wet and dirty" doesn't use a participle. It can't be the present perfect. So I'm wet is the simple present, I've fallen is the present perfect, and I'd fallen is the past perfect. I'm wet doesn't talk about the past, it talks about the current state. We can use the past simple when one action comes immediately after another. He did the washing and then he cleaned the windows. We use the past perfect with the past simple to give a reason for a situation. We use the past simple for the situation, and we use because + past perfect for the reason. I was happy (the situation) because I'd got
The verb go has two past participle forms: been and gone. We use been when we know that someone has returned from a place. Dad's been to the supermarket. (= He went and now he has come back.) We use gone when the person has not returned. Dad's gone to the supermarket. (= He is still at the supermarket.)
The basic idea is that the speakers often used the present perfect in place of the simple past. Here is an example from the research, a short part of a radio broadcast on Triple J radio Sydney.
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  • how to use past simple and present perfect