What grammatical structure is the italicized portion of the sentence?

Although her personality had not changed at all, Megan looked quite different.

Which part is italicized?

addressed to my sister.

The italicized portion of the sentence "Although her personality had not changed at all" is an introductory adverbial clause.

To identify the grammatical structure, we can break down the sentence and analyze its components:

- "Although" is a subordinating conjunction that introduces a dependent clause.
- "her personality had not changed at all" is the dependent clause, which contains a subject ("her personality") and a verb ("had changed").
- The entire dependent clause functions as an adverbial phrase because it modifies the main verb in the sentence, "looked."

Therefore, the italicized portion of the sentence is an introductory adverbial clause, as it sets the context for the main clause (Megan looked quite different).