Errors such as saying "goed" instead of "went" illustrate children's understanding of which language aspect?

The choice highlighting morphology is accurate because it pertains to the structure and formation of words, specifically how children modify verbs to indicate tense. In the case of "goed" instead of "went," the child is demonstrating an understanding of the regular morphological rule of adding "-ed" to create past tense, even though "go" is an irregular verb that does not follow that pattern. This illustrates that children are actively learning language rules and applying them, showcasing their morphological development.

Phonology would focus on the sounds of speech rather than the structure of words. Semantics deals with the meanings of words and phrases, and pragmatics involves the social aspects of language and how context influences communication. Since the child's mistake is rooted in the formation and modification of a verb, morphology is the correct aspect to consider in this situation.