il aime ça? (you say this in an informal situation) est-ce qu'il aime ça (you say this with the interrogatif marker "est-ce que" which is a yes/no question) l'aime-t-il? (inversion - you put your verb in front and your subject at the back of the sentence. used usually in very formal situation such as in a writing assignment) So my choice and to sound more natural when speaking is - il aime ça? Hope that helps!