<p>Well, if you look up the term “sentence adverb,” you’ll get many sources that comment on it. If you Google “sentence adverb” site:.edu, you’ll get sources from colleges and universities. Here is one source, from language-experts of University of Pennsylvania:
[url=<a href=“http://itre.cis.upenn.edu/~myl/languagelog/archives/002925.html]Language”>Language Log: Love, adverbially]Language</a> Log: Love, adverbially<a href=“CTRL+F” title=“sentence adverb.”>/url</a></p>