What is the third stage of question formation as theorized by Bellugi?

The third stage of question formation, as theorized by Bellugi, involves manipulating syntax to create detailed questions. In this stage, children begin to demonstrate a more complex understanding of language structure, allowing them to form questions that utilize various syntactic configurations. This indicates a significant development in their language skills, where they not only use basic forms but also start to manipulate word order and incorporate more elements into their questions, reflecting an understanding of the grammatical rules governing their language.

In the earlier stages, children might rely on simpler strategies, such as using intonation or basic question words. However, by the third stage, they are moving beyond these simpler forms to construct more complex sentences that convey specific inquiries. This reflects a deeper cognitive processing of language and a growing familiarity with syntax.