You can only make verbs formal. For example  you would say to ´nasilsin´ to your friends but ´(siz) nasilsiniz   to your ´superiors or older people.

If you want to make the imperative(command) form of a verb more formal it goes like this

birak!

birakýn ! (more formal)

birakýnýz!  (extremely formal and used in public notices and warning signs)

Tesekkurler..