Just as we form new sentences from the given sentences using words like 'and', 'but', 'if', we can get new propositions from the given propositions using 'connectives'. But a new sentence obtained from the given propositions using connectives will be a proposition only when the new sentence has a truth value either T or F (but not both). The truth value of the new sentence depends on the (logical) connectives used and the truth value of the given دانلود