Writing & Editing Is that one word or two? You can never know for sure unless you look it up, but there are some general rules for when you should keep words separate and when you should put them together. By Laura Hale BrockwayMarch 19, 2014 SHARE Ragan Insider Premium Content To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.