score:5
I think one good way we can look at this and understand that that section was commandments instead of promises is by letting other parts of Scripture that either reference or comment on it help define it.
For example in the NT we find Jesus giving a sermon and instructing people on the way they should live. In several cases he clearly references the statements we find in Exodus 20 and expounds on them to show the scope of the commandments is even larger than sometimes understood.
Mathew 5:27-28 (ESV)
You have heard that it was said, βYou shall not commit adultery.β But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.
This is clearly a reference to Exodus 20:14, and using Jesus understanding of it and how other people in Scripture used that passage in their own teaching, we can understand that it was indeed a command.