Sentence structures of trainable and educable mentally retarded subjects.

Educable and trainable mentally retarded children were administered a story completion task that elicits 14 grammatical structures. There were more correct responses from educable than from trainable mentally retarded children. Both groups found imperatives easiest, and future, embedded, and double-adjectival structures most difficult. The children classed as educable produced more correct responses than those termed trainable for declarative, question, and single-adjectival structures. The cognitive and linguistic processing of both groups is discussed as are the implications for language remediation.