Another time lay out some of his clothing, and ask him to name what he would like to wear. Avoid set drills and exercises such as counting, saying the alphabet, or repeating lists of words. You are seeking the free expression of his thought, and mechanical repetition has nothing to do with communicating ideas. In fact, it may delay it. Introduce him to verbs after he has learned to name objects.
Verbs come next.
Do this with many verbs and nouns. Add other parts of speech to his vocabulary. When he reaches this last stage, he can usually make new sentences himself. These words are very hard for some people to say and to understand. They can be added to his speech at a much later date.