Laughed... laughed would be the action being done in this sentence
I believe it's unknown since the Mississippi is the predicate and unknown is a describing word, a.k.a. an adjective but I'm not sure
Good luck, hope I helped!
An adverb describes a verb, an adjective, or another adverb and answers the questions how, how often, when, and where.
How did the frog jumped into the frigid water? Suddenly.
<span>The word "suddenly" describes the verb "jumped" by answering the question "how?". </span>
