Based on the sentence, the adverbial clause is "after he finishes football practice". Adverbial clause is a set of words that is usually preceded by subordinating conjunctions such as after, if, etc.It usually answers the question when, where, what, how or by how much.
It's expression of subjective feelings, contractions, and first-person point of view.(:
Context clues!! Rereading the surrounding text can give a reader hints about the meaning of the unknown word.
