history: you know at work, one of my coworker is always singing to himself, it bugs me you know at work_comma_ one of my coworker is always singing to himself_comma_ it bugs me Oh dear_comma_ but are you allowed to sing at work? That must be so annoying.
current: it really is, he thinks he knows how to sing, i would not be so annoying if he knew how to sing 
next: He needs to just sing in the shower. Tell him to quit singing.