| qui | who, which: in the subject function it refers to people and things, after the preposition - only to people |
| que | which, whom : in the object function - both about people and things |
| quoi | about things after a preposition |
| dont | whose |
| où | for place and time description, most commonly: where |
| lequel | variation by genus, used in place of "qui" and "que" when there is probability of misunderstanding |