“PARTS OF SPEECH”
“We need to divide words according to the functions they perform and categories they fall in. So, those different kinds or classes in which we divide words are called parts of speech.”
Words are categorized among different classes on the basis of their use that is according to the work they perform in a sentence. As, a sentence is composed of different words joined together in a specific order. That is why we say that different parts of speech combine together in order to make a single complete meaningful sentence.