莫 + Verb Phrase + ?
The word 莫 (mò) is used in classical or poetic Chinese to express a rhetorical question meaning "could it be that" or "is it possible that." It carries a tone of doubt or tentative speculation and is rarely used in everyday speech. For example, 莫是他来了? means "Could it be that he has come?"
莫是你已经知道这件事了?
Mò shì nǐ yǐjīng zhīdào zhè jiàn shì le?
Could it be that you already know about this?
他迟迟不来,莫是路上出了什么事?
Tā chíchí bù lái, mò shì lùshang chū le shénme shì?
He's been so late in coming—could something have happened on the way?
莫是我记错了日子?
Mò shì wǒ jì cuò le rìzi?
Could it be that I got the date wrong?