L.L.
Hi E.,
my 3yr old was the same way, still tries to get away w/ things at times.
ok, first, you have to give him instruction, make him reapeat what said if necessary and tell him, "ok, you have to be obediant and listen to mommy and if you do not you will get consequence and if he disobeys then punish him w/ time out or whatever method you use. but tell him he will go in time out if he does not listen because he HAS to be obediant and then MAKE HIM listen
L.