Is you said correct grammar?

The sentence "You said correct grammar?" is grammatically incorrect.

Here's why:

* Missing subject: The sentence is missing a subject after "You." It should be "Did you say..."

* Word order: "Correct grammar" should be placed after "say" to make the sentence flow better.

Here's a corrected version:

Did you say that sentence has correct grammar?

Let me know if you have any other questions!