Is it correct to say "With who do I share my pain?" or "With who do you watch your favorite films?"
Is there any other way to ask similar things?
Thank you very much!
The word 'whom' is used instead of 'who' when it is the object of a verb or preposition:
I met a man with whom I used to work.
He took out a photo of his son, whom he adores.
There were 500 passengers, of whom 121 drowned.
To whom do you wish to speak?
Therefore, "With whom do I share my pain?" and "With whom do you watch your favorite films?" are the correct forms to use.