A good test for whether a term is an argument marker is to the sentence still means the same as the original sentence.
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
swap the position of the clauses on either side of the term and see if
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.