Two-year-old aiden asks his mom if she "bringed" his favorite toy with her. his use of "ed" on the end of the word "bring" to make it past tense indicates an understanding of

The correct answer is morphology.

Morphology is part of language studies that deals with words and their constituent parts. So, in English, past tense of regular verbs is formed by adding the suffix - ed to the verb. Aiden clearly understands this rule, but he isn't aware of irregular verbs (such as 'to bring') which is why he applied the same rule here, however, this rule is incorrect.