Note that there are three ways of asking questions using qui as the object of the verb: who did he call? = qui est-ce qu'il a appelé?, qui a-t-il appelé?, il a appelé qui?
- 1 (in questions) (as subject) qui (est-ce qui) (as object) qui (est-ce que) (after prepositions) qui who knows the answer? qui connaît la réponse? who's going to be there? qui sera là? who did you invite? qui est-ce que tu as invité?, qui as-tu invité? who was she with? avec qui était-elle? who did you buy it for? pour qui l'as-tu acheté? who did you get it from? qui te l'a donné?