One frequently found difference not present in most Indo-European languages is a contrast between inclusive and exclusive "we": a distinction of first-person plural pronouns between including or excluding the addressee.
[2] Many languages express person with different morphemes in order to distinguish degrees of formality and informality.
Some other languages have much more elaborate systems of formality that go well beyond the T–V distinction, and use many different pronouns and verb forms that express the speaker's relationship with the people they are addressing.
In many languages, such as French, the verb in any given tense takes a different suffix for any of the various combinations of person and number of the subject.
[citation needed] The so-called "zero person"[7][8] in Finnish and related languages, in addition to passive voice, may serve to leave the subject-referent open.