The word "drink" is the base form of the verb, while "drank" is the past tense form. In this context, "drank" is the correct past tense form of the verb "drink" because it indicates an action that occurred in the past. "Drunk" is the past participle form of the verb and is used in combination with auxiliary verbs, such as "have" or "had," to form the perfect tenses. "Drinked" is an incorrect form and does not exist in standard English grammar.