Well, it's not the best, but you can give it a try. 1. Give the students some categories like favourite actor, Favourite band etc. 2. Tell them to write at least 5 names in each category. 3. Put them in pairs and make them ask questions like "What do you think of Brad Pitt?", the other student can answer like "I don't like him." or "I love him" etc. This way they will learn how and where to use the object pronouns. 4. You can also give them some additional adjectives, extra phrases so they can give more elaborate answers. Hope that helps!