A list of adjectives is usually separated by commas. Isabel has a big house . This book is fantastic. The dull, boring, uninteresting lecture went on for over one hour. Notice the commas between adjectives.
Adverbs modify verbs, adjectives, or other adverbs.
Adverbs can be placed in the beginning of the sentence, at the end of the sentence, or before an adjective. Answer the question slowly. He talks quickly . A Preposition is a word which comes before a noun or pronoun to form a phrase modifying another word in the sentence. The prepositional phrase nearly always functions as an adjective or adverb.