Once your dog understands some verbal cues mark them down on cards. Keep them in a hat or box. Before you go out for a walk or other time during the day, reach in, grab one and ask your dog to do it.
This takes away the predictable behaviour patterns humans fall into and tests whether or not your dog truly understands the cues you use.
Dogs often offer behaviour based on context and not because you cue it.
Make sure your dog is able to do each behaviour separately before combining.