Some words appear to be strong enough to join two sentences, but in reality they're just a bunch of 98-pound weaklings. Think of these words as guys who stuff socks in their sleeves, creating biceps without all the hassle of going to the gym. These fellows may look good, but the minute you need them to pick up a truck or something, they're history. False joiners include however, consequently, therefore, moreover, also, and furthermore. Use these words to add meaning to your sentences . . . but not to glue the sentences together.