Can you please check these sentences for me?

-Write a sentence that includes an adverb modifying an adjective

That person is sad.

-Write a sentence that includes an adverb modifying an adverb

I like to eat fast.

Please let me know if these are right.

thank you

You have the adjective and the adverb in each sentence, but you have nothing modifying them. Here's the difference:

That person is really sad.
("Really" is an adverb; it modifies the adjective "sad.")

I like to eat very fast.
("Very" is an adverb; it modifies the adverb "fast.")