имею дело

am dealing with

→ иметь
phrase Uncommon #14,852
am dealing with Often used with с + the instrumental case to identify the person or thing someone is dealing with.
RU: Я имею дело с трудной задачей.
EN: I’m dealing with a difficult problem.

Я знаю, с чем имею дело.

I know what I'm dealing with.

Я забыл, с кем имею дело.

I forgot who I was dealing with.