1. as I know
2. to the best of my knowledge
I answered to the best of my knowledge
He didn’t do this to the best of my knowledge.
3. as far as I can make out
Anglais mot "z tego co mi wiadomo"(as far as I can make out) se produit dans des ensembles:
the red-headed 34. As far as I am concerned
5. as far as i can tell