General:
* Qui aime? - This is the most literal translation and asks "Who loves?" in a general sense.
* Qui est amoureux? - This means "Who is in love?" and is more specific to romantic love.
Specific:
* Qui aime [person/thing]? - You can add the object of love after "aime" to specify who or what is being loved. For example: "Qui aime le chocolat?" (Who loves chocolate?)
* Qui est amoureux de [person]? - This is similar to the above but is more specific to romantic love and requires the person being loved. For example: "Qui est amoureux de Marie?" (Who is in love with Marie?)
In a sentence:
* Je me demande qui aime [person/thing]. - This translates to "I wonder who loves [person/thing]."
* Qui est celui/celle qui aime [person/thing]? - This means "Who is the one who loves [person/thing]?"
It's important to choose the translation that best fits the context of your sentence.