Always be a good listener. When a child tells a story and has an attentive audience, they are likely to feel comfortable and confident.
Talk to your child as you would talk to an adult. Don’t use baby talk or try to simplify your conversation on his account. If he does not understand something, he’ll let you know. And that opens the door to learning.
When your child uses a word incorrectly or pronounces a word wrong, it’s alright to correct them but you should do so in a discreet way that does not belittle them. For instance, if your child says, “I runned real fast,” say, “Wow, you ran real fast?” If you correct them in a way that makes them feel inadequate, they will become self-conscious about speaking.
Build your child’s vocabulary by using a variety of words to describe something. Instead of always saying “car”, say “vehicle” or “automobile”.
Allow your child every opportunity you can for them to speak to other adults. When you are out at a restaurant for example, let your child tell the waitress what he wants.