An adverb can modify an adjective by intensifying the adjective. Here are some common intensifier adverbs: very, really, completely, extremely, totally, pretty, mostly, quite
Mary is a pretty girl. Pretty is an adjective modifying the noun girl.
Mary is a very pretty girl. Very is an adverb modifying the adjective pretty.
John is a motivated student. Motivated is an adjective modifying the noun student.
John is an extremely motivated student. Extremely is an adverb modifying the adjective motivated.
Use an adverb to modify an adjective by intensifying the adjective.
It’s your turn. Find the intensifier adverb in this sentence: Sue is a really smart student. Did you find the word that intensifies smart? Good for you!