These parts of grammar are difficult for them and can influence the writing of sentences. For a student with Down syndrome, they find large deficits in syntax. The emergence of two-word combinations is delayed in young children with Down syndrome, and children and adolescents with Down syndrome continue to produce shorter and less complex utterances than peers of the same age. For example, Price and colleagues (2008) found that a group of 31 boys with Down syndrome produced less complex noun phrases, verb phrases, sentence structures, and less complex questions and negations when speaking to an examiner than younger boys. typically developing with similar nonverbal abilities. mental age. Morphology is the organization of words. Morphology is the set of rules that represents the ability to identify, analyze and describe linguistic morphemes and other linguistic units. For example it is in the word expedition, ship - it is a free morpheme. A free morpheme(s) is a morpheme(s) capable of standing alone as a word. However, -ing, -ed, re-, etc. they are bound morphemes, meaning they are just part of another word, not a word within it.