Although English has hundreds of thousands of words, every one can be placed into at least one of eight groups, or classifications. The system of classifying words based on their function is known as the parts of speech.
The eight parts of speech are:
Learning about the eight parts of speech will help you understand the grammar explanations of some of the mistakes you make and figure out how to correct them.Because some words can be used in several different ways, you have to look at what a word is doing in a specific sentence before you can classify it (name its part of speech). For example, look at these sentences.
He ran fast so he wouldn’t be late. (describes how he ran...adverb)
They will fast to raise money for UNICEF. (tells about an action...verb)
Their fast lasted for three days. (names a thing...noun)
The word “fast” is spelled the same, but it functions differently in each sentence.