Could you help me, please?
A question for the native speakers (desired) of British English or American English.
Which variant is correct and why? Or it's possible to use either of them)?
If only had I known it! If only I had known it!
In the US I most frequently hear
"If only I had known"; when I was home in Britain I also heard a variant construction:
"Had I but known" which I've almost never heard here in the US.