Many people consider learning grammar a chore. And at times, it can be. But understanding the grammar of any language is essential for becoming a skilled and accurate user of that language. English is certainly no exception.
Standard grammar is composed of the traditional rules for English. It is what grammarians and English professors want everyone to use when they speak and write. But a language evolves over time, and the traditional rules sometimes seem out of step with what is going on in the English-speaking world. The more current or popular usages can be called casual language. That’s what people really say in their everyday lives and is often in direct contradiction with standard grammar. As an illustration, in standard grammar you should use who as the subject of a sentence and use whom when it is used as an object. But that’s not always the case in casual language.








