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

Answer 1

Entire sentences do not have parts of speech; instead individual words or small groups of words do. Other groups of words may function as a single part of speech, but each word or small word group within such a phrase or clause is still usually assigned its own part of speech. In the sentence given:

• "Aunt May" is a noun, a proper noun; some would prefer to say that each of "Aunt" and "May" is a noun, and one of the nouns is in apposition to the other;
• "chirped" is a verb in its past tense;
• "when" is a subordinating conjunction introducing an adverbial clause;
• "she" is a pronoun, standing in for "Aunt Mary";
• "met" is a verb (in its past tense);
• "the" is an article (both instances);
• "girls" is a plural noun;
• "at" is a preposition;
• "door" is a noun.

Answer 2

In this sentence, "Aunt May" and "the girls" are nouns, "chirped" is a verb, and "when" is a subordinating conjunction that introduces a dependent clause.