Therefore, there is little change in its spelling with the addition of the noun-forming suffix. As the verb is changed to a noun, its usage may cause a slight alteration in its meaning. A suffix is a group of letters added to the end of a word to change its meaning or its part of speech. Adjectives and adverbs can be formed from other parts of speech. An adjective can be used to modify a noun.
Adverbs modify verbs or adjectives.
Many adverbs are formed by adding -ly. The tense of a verb shows time. To show the present, past, and future tenses of regular verbs, suffixes may be affixed to the base word. There are spelling rules to govern final consonants when adding suffixes. There are many irregular forms of verbs that do not use affixes to denote tense.