Adjectives:
* Red car
* Beautiful sunset
* Fast runner
* Angry dog
* Ancient artifact
Adverbs:
* Quickly run
* Loudly sing
* Carefully drive
* Sadly depart
* Happily ever after
Articles:
* The book
* A cat
* An apple
Possessive Adjectives:
* My house
* Your car
* Her book
* Their dog
Demonstrative Adjectives:
* This chair
* That book
* These shoes
* Those apples
Indefinite Adjectives:
* Some people
* Any questions
* All students
* Few cars
Quantifiers:
* Many friends
* Several apples
* Few mistakes
* Much time
Other:
* Not finished
* Very happy
* Too slow
Important Note: While the examples above are all single words, it's worth noting that some phrases can also act as modifiers. For example, "very large" is a two-word phrase that acts as an adjective modifying "house."
Ultimately, the key to identifying a single-word modifier is to look for a word that describes or modifies another word.