They need to use synonyms, adjectives and idiomatic expressions more freely. For example, once the child learns a word, switch to a synonym. This will increase vocabulary development. When the child learns couch, then it should become a sofa. Sad should be unhappy, disappointed, frustrated, angry or upset.
Different people say things in different ways.
Use of expressions used by the deaf child's peers enhances his understanding and use of language. Use of descriptive words and other adjectives are important as well. Teeth are pearly white. He is wearing a long-sleeve plaid shirt. In 1966, when Dr. R. Orin Cornett realized that it was access to spoken language that prevented the deaf child from internalizing spoken language, he invented Cued Speech.