何尝不是……

何尝不是…… means "is it not also; indeed is" and follows the frame A 何尝不是 B. Use it when the sentence needs to use a rhetorical question to affirm that A is also B. 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 难道不是, 岂不是, 也是, or using a rhetorical pattern in a neutral statement.