1. Tense: The sentence refers to an action that took place in the past ("last night"). Therefore, the verb must be in the past tense.2. Verb Forms: - "eat" is the base form of the verb. - "eats" is the third person singular present tense form (used with "he," "she," or "it"). - "ate" is the simple past tense form of the verb "eat."Since the action occurred last night, the correct choice is "ate," which indicates that the action of eating dinner has already been completed.