¹  Indeed, if you were to know ˹your fate˺ with certainty, ˹you would have acted differently˺.  Dr. Mustafa Khattab

²  Nay, if you could but understand [it] with an understanding [born] of certainty,  Muhammad Asad

³  If you knew with knowledge of certainty.  Talal Itani

⁴  Nay, would that you knew with certainty of knowledge (what your attitude will lead to, you would never have acted the way you do).  Maududi

⁵  Nay! If you knew with a sure knowledge (the end result of piling up, you would not have occupied yourselves in worldly things)  Muhsin Khan

⁶  No indeed! If only you knew for certain.  Muhammad Abdel Haleem

⁷  No indeed! If you will know with the knowledge of certainty,  Dr.Leila Bakhtiar

⁸  Nay, would that ye knew (now) with a sure knowledge!  Marmaduke Pickthall

⁹  No! If you only knew with knowledge of certainty...  Sahih Int.

¹⁰  Nay, were ye to know with certainty of mind, (ye would beware!)  Yusuf Ali

¹¹  nay! if you know (with) a knowledge (of) certainty.  Word by Word