The easiest way to help children develop in this area is to talk to and with them! By having frequent conversations with your child, you are teaching them and helping them practice communication skills. Comment on their interests and what they choose to do. Talk to them about the activities they do and the games they play. Encourage them to express their ideas and ask them what they are doing and why they are making the choices they do. You can echo what they say and add new words into your response to help teach them new words.
Play with your child! Role play is a favorite type of play for this age group and a great way of modelling and learning language.
A brilliant way to help communication and language development is to read to your child! Reading often with children and engaging them in stories, non fiction, rhymes and poems will expose them to many new words and contexts. Talking to them and asking questions about what you are reading will increase their comprehension skills.
With frequent conversation, story telling and role play and opportunities to talk and express their ideas, children’s communication and language will develop until they are comfortable using a good range of words and language structures.