莫非……

莫非…… means "could it be that; perhaps" and follows the frame 莫非 A. Use it when the sentence needs to express a tentative guess, often with surprise or doubt. 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, 是不是, 该不会, or using a rhetorical pattern in a neutral statement.