"That man is sitting on the chair."
Translation:वह आदमी कुर्सी पर बैठा है।
If you mean बैठ रहा then no, बैठा sounds more natural. Looks a little weird compared to the normal way of conjugating verbs, but it's correct.
How can I type कुर्सी? I can't figure out a key combination that gives me that symbol.