Final answer:
The underlined word 'a while' in the sentence acts as a noun phrase, so the correct answer is 'a. Noun'. Learning to identify the parts of speech is fundamental in understanding sentence structure and grammar.
Step-by-step explanation:
The part of speech of the underlined word in the sentence Sit down and rest a while must be identified. In this case, 'a while' functions as an idiomatic expression and as such, it serves as a noun phrase. Therefore, the correct answer is: a. Noun. Understanding the parts of speech, such as nouns, adjectives, verbs, and adverbs is crucial for constructing grammatically correct sentences.
These basic parts of speech, alongside phrases that serve similar functions, help to identify the role that a word or group of words plays within sentence structure. It's important to recognize the form and function of words or phrases to properly distinguish between different parts of speech.
A noun is a word that names something, such as a person, place, thing, or idea. In a sentence, nouns can play the role of subject, direct object, indirect object, subject complement, object complement, appositive, or modifier. Some noun examples include: cat.