Google “cannot,” you get “About 1,050,000,000 results (0.15 seconds).” 

Google “can not,” you get “About 518,000,000 results (0.15 seconds).”

Now you see which one I would use.

If you put these two in a Word file, Bill Gates would tell you the latter is wrong.

No, you don’t need to take Bill seriously, since he never graduated from college. 

No, you don’t have to accept my tracked change, because I am only showing you what I would do.

However, what you can't do is to use "can't" in a research paper. Can someone explain why?

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