Replacing past perfect and present perfect by past simple tense.

[isahne]

In what case can we replace past perfect and present perfect with past simple tense?
I'd like to know cases in detail, please.

[queenbu]

Originally Posted by isahne

In what case can we replace past perfect and present perfect with past simple tense?
I'd like to know cases in detail, please.

Actually I don't see it as a matter of replacing past perfect and present perfect with simple past but rather a case of when to use one tense and not the other.