岂不……

岂不…… means "would it not; surely" and follows the frame A 岂不 B. Use it when the sentence needs to use a rhetorical question to show B is obvious or expected. Pay attention to register: many patterns in this group are formal, evaluative, or rhetorical, so they are stronger than everyday words. Do not choose a pattern only because the translation looks close; check whether the sentence is evaluation, sufficiency, inevitability, suggestion, or rhetorical affirmation/denial. Common mistakes include dropping fixed characters such as 于, 是, 不, 能, 非, confusing 难道不, 不是...吗, 岂非, or using a rhetorical pattern in a neutral statement.