Past tense vs Past participle

[Sushebert]

I had walked to the store (past participle)
I walked to the store (past tense)

What is the difference between these two statements and how do you decide which to use?

[billmcd]

Both are OK depending on what precedes, follows or is included in the same sentence i.e. context. Submit more detail.

[2006]

I had walked to the store. (past perfect tense)
I walked to the store. (simple past tense)

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