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Using the Leonard corpus which is collected before the formulation of the Agreement and Tense Omission Model, the Agreement Deficit Model, and the Representational Deficit for Dependent Relations Model, the present study tries to evaluate these three accounts of SLI and to figure out the nature of grammatical errors made by SLI children. It is found that the SLI children in the Leonard corpus frequently commit errors on tense marking, agreement marking and AUX inversion but correctly perform other syntactic operations such as case assignment, A-movement and Wh-movement. However, in terms of Chomsky’s Minimalist Programme (1998, 1999), it is shown that SLI involves a PF deficit rather than a syntactic deficit. As a result, it is found that none of the three linguistic models of SLI is compatible with this finding. |
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