Whatever human beings feel, think or imagine, they express it through language which is the combination of the sounds of mouth called words or the combination of the words which form sentences. So the problem arises that what type of sentences are correct and how they are able to communicate our inner feelings or latent thoughts and how can we distinguish correct and incorrect sentences. This need and curiosity to express oneself correctly have led thinkers to invent a technique or a science which can provide us the rules which can help us to think properly and to express our thoughts into correct form of sentences. Aristotle is regarded as the first thinker who discovered the rules of thought and invented the science of valid thought...