Then no! You are going to know.
ثُمَّ كَلَّا سَوْفَ تَعْلَمُونَ
No! You are going to know.
كَلَّا سَوْفَ تَعْلَمُونَ
Then, no! They are going to know.
ثُمَّ كَلَّا سَيَعْلَمُونَ