This very common affix is attached to a verb to indicate someone or some people who do something with someone else:
| ilinniaq- | to study |
| ilinniaqati | classmate |
| iqqaniajaq- | to work |
| iqqaniajaqati | co-worker |
| pi + qati = piqati | friend; companion |
-qati is often followed by the verb -gi- meaning to have, which is in turn followed by a double person ending:
| Susi ilinniaqatigijara | Susi is my classmate (literally, I have Susi as a classmate). |
| Katimaqatigijunnaqqinnga | Can you meet with me? |
-qati- + -gi- can also be put in the dual or plural to form a word that can stand on its own:
| mumiqatigiik | two people dancing together |
| niriqatigiit | several people eating together. |