Write one paragraph describing the difference between grammar and usage. I have to score 20 points on this paragraph and I don't even know what to say in it.

Grammar is the whole system and the structure of our language in general.

This is all I got. What can I add to get a C atleast?

Have you looked up those terms in a dictionary or on Google? Once you have a good definition for each, you can write example sentences with incorrect grammar and then correct grammar, with incorrect usage and then corrected usage.

To expand on the difference between grammar and usage and score higher on your paragraph, you can include more details about each concept. Grammar refers to the set of rules that govern the formation and arrangement of words, phrases, and sentences in a language. It encompasses aspects such as verb tenses, sentence structures, and punctuation. It provides the foundation of a language and allows for effective communication. On the other hand, usage focuses on how language is actually used by native speakers in everyday conversations and writing. Usage pertains to the choices individuals make when using words, expressions, and idioms, often influenced by factors like dialect, register, and context. By including these additional details, you can provide a well-rounded explanation of the difference between grammar and usage in your paragraph.