Most of what children learn by hearing words in context and matching them to meaning, children learn about the world around them. However, children with hearing loss will miss out on incidental learning if they cannot hear the key language in their environments. An area of language that often needs more careful and planned exposure for children with hearing loss is understanding and using comparative word endings (such as ‘er’ or ‘est’.
http://heartolearn.org/materials/docs/E28_Falling%20from%20the%20Sky%207.25.17.pdf