There is the article 'Practice really does make perfect' at http://www.cam.ac.uk/research/news/practice-really-does-make-perfect
My question is why adverb is placed before 'does make'? Is 'do make' one word?
There is the article 'Practice really does make perfect' at http://www.cam.ac.uk/research/news/practice-really-does-make-perfect
My question is why adverb is placed before 'does make'? Is 'do make' one word?
"Do" in that sentence is used as an emphasis.
If we're gonna look at the context you have given (from University of Cambridge):
New research into the way in which we learn new skills finds that a single skill can be learned faster if its follow-through motion is consistent, but multiple skills can be learned simultaneously if the follow-through motion is varied.
See, from the way the sentence was phrased, it is implied that it's already common knowledge for a skill to be learned through practice (i.e. consistent follow-through motion). But if you look at the latter part of the sentence, they're adding something else which further proves the first point. They're emphasizing that practice makes perfect.
Here is a good resource which talks about "do" as an emphasis.