Learning how to ask: patterns of inversion in yes–no and wh-questions

This study attempts to determine whether subject–auxiliary inversion occurs in yes–no questions before wh-questions and whether non-inversion errors (when daddy will come home?) are a characteristic feature of the acquisition of wh-questions. The data consist of the yes–no and wh-questions of 18 children, aged 2;5 to 3;0 with an mlu range of 2.66–4.26. Findings do not support previous claims that inversion is acquired in yes–no questions before wh-questions. Rather, a significant number of children were found to use an optional inversion rule in both question types. This fact appears to account for the finding that non-inversion errors are a characteristic feature of the acquisition of wh-questions.