mok6 fei1莫非

Jyutpingmok6 fei1
Yalemohk fēi
副詞Common

Definition

Could it be that, or is it possible that; used to suggest a possibility that should be considered.

neutralcommunicationother

How it's used

Functions as a rhetorical marker used when the speaker is speculating about a situation that seems unlikely or surprising. It carries a slightly more formal or literary tone compared to the ubiquitous 唔通. While 唔通 is the go-to choice for casual daily conversation, 莫非 is often preferred in writing or when one wants to sound more contemplative and measured.

Examples

Could it be that you forgot you have to go to work today?
He hasn't arrived yet, could something have happened to him?

Common phrases

could it be that it is
could it be that you

Common mistake

Learners often treat this as a direct equivalent to maybe, but it specifically introduces a rhetorical question or a suspicion that requires confirmation. It is rarely used to express simple possibility in a neutral statement.

Grammar color guide

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