"Even though they have had to fight for funding" is an introductory clause; it "sets the stage". A clause constitutes a grammatical sentence: it has a subject and a verb. So the clause can not be an adverb or an adjective.
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MIA6The definition of a sentence is a sentence consists of a subject and a predicate, Or clauses, but always makes a "complete" statement. Is that right? If not, please correct. So here is another question: What is a word group? Is a word group a sentence or not? Is phrase a word group? Is clause a word group? If they both are word groups, then a word group can be a