Preschool children learn and apply syntax rules."When we are going outside?" is an example of difficulty with mastering:

Question

Quizplus · Accepted Answer

The sentence "When we are going outside?" is syntactically incorrect because it violates the auxiliary-inversion rule. In this rule, an auxiliary verb (such as "are") must come before the subject (such as "we") in a question. Therefore, preschool children who struggle with this sentence may be having difficulty mastering the correct application of syntax rules. Choices A, C, and D are not applicable to this specific sentence.

Preschool Children Learn and Apply Syntax Rules