Questions about example sentences with, and the definition and usage of "Adverbs"

A: Muchas palabras tienen "-ly".
I go QUICKLY.
She refuses FIRMLY.
I'm asking TRUTHFULLY.
He touches the cat CAREFULLY.

A: He ran quickly. She walked slowly.

A: "He swims well."
"He ran quickly."
"She spoke softly. "
You can use them when you are talking about someone in the past tense.
"James coughed loudly to attract her attention"

A: Yes! Here are examples of adverbs:

Quickly
- example: “She runs quickly.”
- Comes from the word quick. example: “The horse is quick.”
- Can I say that someone runs “unquickly” (not quickly)?
No. This is because “unquick” is not a word.

Helpfully
- example: “He cleans helpfully.”
- Comes from the word helpful. example: “He is a helpful person.”
- Can I say that someone is working unhelpfully?
Yes! This is because “unhelpful” is a word. “He is very unhelpful at work.”

I hope this makes sense! Let me know if you would like me to explain anything else. :)

A: I believe things would need to be plural to match the subject.
Also I believe this sounds better: Adverbs describe things such as verbs, adjectives, adverbs, or whole sentences.

A: There are a few words that are both an adjective and an adverb, such as early and weekly...otherwise, adverbs can't modify nouns.