Those are participle clauses. They give extra information about the situation described in the main clause. You can find a lot of information about them on-line as well as on this site.
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AnonymousNo nonsense about "it just looks right".You've got some nerve saying that. I'm surprised that CJ even bothered to answer you, because I wouldn't. No please or thank you, just a rude aside about the knowledge of the people who freely give up their time to answer questions from ill-mannered people like you.