For many, learning grammar means learning how to speak and write in polite society. That may have some value, but it is not the sense in which linguists think of grammar, and it is not the sense in which this blog considers it. Grammar is the set of rules that tell us how to make words and sentences. We learn them by the time we’re of school age. We don’t learn grammar at school. We learn, or we should learn, about grammar at school. You may even learn a bit about it here.