It is almost impossible to write a sentence without a verb or a noun, since these parts of speech constitute many of the words in the English language. Adverbs and adjectives modify verbs and nouns respectively. They give the reader a better description of a noun, and they let us know more exactly how a verb was completed. English speakers need to be able to identify the different parts of speech. It can seen as parts of speech are very important in TOEIC test.