Could you please clarify what you mean?
Here are some possible interpretations and how they might be phrased correctly in French:
* "Do you understand what I'm saying?" - *Comprenez-vous ce que je dis?*
* "Do you know what I'm saying?" - *Savez-vous ce que je dis?*
* "You'll say..." - *Tu diras...*
Please provide more context or the full sentence so I can assist you better.