4. For each TFL sentence, (V) and (VI), say what its main connective is and say whether it is a negation, conjunction, disjunction, conditional or a biconditional. Provide a list of all the forms each of these sentences have. (1) (See Exercise for Syntax of TFL (Revised Jan. 18, 2020) (V) ~(-A) B) (VI) -(D = C) v~E