Final answer:
Adverbs are the part of speech that answer questions like how, when, where, and how often, by providing additional information about the actions or conditions described by verbs, adjectives, or other adverbs.
Step-by-step explanation:
The part of speech that answers the questions how, when, where, and how often is the adverb. These words are designed to modify verbs, adjectives, or other adverbs, providing more detail about the action or condition. They can come in the form of a single word, or as part of a phrase, known as adverbial phrases. Understanding and identifying adverbs or adverbial phrases can help students clarify statements as they detail the circumstances of an action, such as timing, location, frequency, and manner. This knowledge plays a crucial role in sentence construction and comprehension, and makes up over 95% of words in the English language along with nouns, adjectives, and verbs.