I see your point.
But, when you read the story of the man caught picking up sticks on the Sabbath, and God’s command to the Israelites to stone him to death, didn’t that help you understand what “Thou shalt not kill” meant?
In other words, did you need the Greek to understand God? Or just more reading? :-)
Don't think Greek would help with that one, unless you were using the Septuagint.