What is the part of speech this sentence Aunt May chirped when she met girls at door?

Let's break down the sentence and identify the parts of speech:

* Aunt May - This is a noun phrase (a group of words acting as a noun). It tells us who the subject of the sentence is.

* chirped - This is a verb. It describes the action Aunt May took.

* when - This is a subordinating conjunction. It connects the main clause ("Aunt May chirped") to a dependent clause ("when she met girls at the door").

* she - This is a pronoun (specifically, a subject pronoun) that refers back to Aunt May.

* met - This is a verb. It describes the action Aunt May took in the dependent clause.

* girls - This is a noun. It tells us who Aunt May met.

* at - This is a preposition. It shows the relationship between "met" and "door".

* door - This is a noun. It tells us where Aunt May met the girls.

Therefore, the main part of speech in this sentence is the verb "chirped".