that's a very complicated question and to properly answer that I would have to explain the entire history of the philosophy of language. however i know nothing about the philosophy of language so i cannot properly answer that question.
but let me try to answer it as best as i can.
frequently we hear "staples is suck". Staples sounds plural, but we don't say staples are suck. but we might argue that staples is in fact not plural. however, there is currently heated debate over the use of "is suck" to true plural words, such as mofos, hoodrats, deez nutz, etc. the path you choose will profoundly change your life forever so choose wisely.