Is it possible to distinguish between:
'to free sb from sth' vs. 'to free sb of sth',
'to be free from sth' vs 'to be free of sth'?
Very often both of the prepositions are possible:
He is suffering from / of pain.
How about 'Let's open the window to free the room from / of smoke'?
Could you make up a sentence where only one of the prepositions could be used?
This is an example where of is not possible.
They will free John from Jail tomorrow.
They will free John of jail tomorrow. X
I am not not a teacher.