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How and when to use have mentioned and had mentioned? To be more precisely, how and when to use have [action] and had [action]?
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I have mentioned refers to an action that occurred at some point in the past.
I had mentioned refers to an action that occurred before another event in the past.
I have mentioned to him several times that he should pay more attention while driving.
I had just mentioned to him that he should pay more attention when he ran into the back of the truck.
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Anonymoushave [action] and had [action]?
have [action] OR has [action] = present perfect tense
had [action] = past perfect tense

See Difference between present and past perfect
See Simple past Vs. Past perfect Tense
See Past / Past perfect
See Past perfect
See Present Perfect Vs Past Perfect
See Too much drink

CJ
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Comments  
What is the correct grammar ... “I thought I had mentioned it” vs “ i thought I have mentioned it”
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book park 604What is the correct grammar ... “I thought I had mentioned it” vs “ i thought I have mentioned it”

I thought I had mentioned it.