***** NOT A TEACHER *****
Hello, Mr. Centeno:
I wish to congratulate you on wanting to understand and to identify those three parts of speech.
I have made up a sentence. The boldface words are nouns; the CAPITALIZED words are adjectives; the underlined words are adverbs.
"Eduard is A very GOOD student who studies extremely diligently."
"a" is an adjective (newer books use the term "determiner").
"very" is an adverb that describes how "good."
"good" is an adjective that describes the noun "student."
"extremely" is an adverb that tells you the degree of "diligently," which is also an adverb that describes HOW Eduard (a noun) studies.
What kind of student is Eduard? A very good student.
How does he study? Extremely diligently.
*****
You may wish to copy a sentence (from a newspaper or book, for example) and identify all the nouns, adjectives, and adverbs. If you post it in the "diagramming" forum, some members will be delighted to check your answers.