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Something had happened there, I don't know what?
Something had happen there, I don't know what?
Comma splice
Something had happened here (Sentence 1),
I don't know what (Sentence 2).
Try,
A. Something had happened here; I don't know what (it was).
B. Something had happened here. I don't know what (it was).
C. Something had happened here and I don't know what (it was).
I guess this is FRC-speak
I meant can the past perfect be used when it is not tied to a precise event in the past (usually marked by a simple past clause) ?
which one is correct 
Linear Mode
