can it be that; is it possible that

• 莫非你还不明白?

  is it possible that you still don't understand?

• 莫非我听错了?

  is it possible that I misheard?

• 莫非是他?

  could it be him?

• 莫非他真的同意了?

  is it possible that he has agreed?

• 今天她没来，莫非生病了不成?

  She didn't come today. Is it possible she is ill?