An adverb — adverb) is an independent and independent part of speech that indicates the sign of an action or the various circumstances under which the action takes place.

The adjective (adjective) is one of the main parts of speech, which denotes a feature of the subject and answers the questions "what?", " whose?".

Adverb and adjective

Sometimes adverbs can be identified by their inherent suffix -ly, but this is not always true, since adjectives can also have such a suffix. 

In sentences, adjectives answer the question what? (which one?) , and the adverbs answer the question how? (how?).

EXCEPTIONS TO THE RULES: 

Good-well (good-well)

Late-late (late-late)

Hard-hard (difficult-difficult)

1) Adjectives describe nouns, while adverbs describe verbs, adjectives, and other adverbs.

2) The adjective always follows the verb "to be" when describing the noun or pronoun that precedes that verb.

3) In sentences containing verbs of sensory perception-feel, taste, smell, sound, look, appear, and seem – adjectives are used, NOT adverbs.