1. Copyright © American Speech-Language-Hearing Association
From: Surface Forms and Grammatical Functions:  Past Tense and Passive Participle Use by Children With Specific Language Impairment
J Speech Lang Hear Res. 2003;46(1): doi: / (2003/004)
Legend:
Mean percentages correct (and standard errors) for the use of past tense -ed and passive participle -ed by the children with specific language impairment (SLI), the normally developing children matched for mean length of utterance (ND-MLU), and the normally developing children matched for age (ND-A).
Date of download: 11/3/2017
Copyright © American Speech-Language-Hearing Association