Play a Game of 20 Questions
Invite your child to play the game 20 Questions. Start by letting him think of the subject while you ask the questions. This way, you can model asking yes or no questions such as, "Is the subject a living thing?" or "Is it edible?" Then, switch roles so that your child is the one asking questions. This will help to strengthen his deductive reasoning skills. If it's helpful, write down a list of the questions and answers as you play the game, and encourage your child not to give up. Perseverance is the key!