Here's why:
* Nouns are the people, places, things, or ideas that the sentence is about.
* Verbs describe the action or state of being in the sentence.
* Adjectives modify nouns, providing more detail about them.
* Adverbs modify verbs, adjectives, or other adverbs, providing information about how, when, where, or to what extent something happens.
These words are the building blocks of a sentence, providing the core information and meaning.
Example:
* The cat (noun) slept (verb) peacefully (adverb) on the warm rug (noun phrase with adjectives).
The key words here are "cat," "slept," "peacefully," and "rug," as they convey the essential meaning of the sentence.