When using the verb "refuse" in a sentence, it is important to follow the correct form of the verb. "Refuse" is a transitive verb, meaning it requires a direct object. The base form of the verb is "refuse," and the past tense and past participle are both "refused." For example, "She refused to go to the party" or "He has refused the offer.

The reason for this consistency in verb form is due to the nature of "refuse" as a transitive verb. Transitive verbs always require a direct object to complete their meaning, and "refuse" is no exception. Using the correct form of the verb ensures clarity and grammatical correctness in communication. According to the Cambridge Dictionary, "refuse" is classified as a transitive verb, which means it must be followed by a noun or pronoun to make sense. This rule applies across various English dialects and is supported by the American Heritage Dictionary, which also lists "refuse" as a transitive verb.