How well do you know grammar?
Grammar is a set of rules that people follow when they speak a language. English's grammar system can be difficult to grasp, even for native speakers of the language, but grasping it can be rewarding, as it might make your prose a lot more readable and coherent.
Do you have a good understanding of English grammar, or do you not understand it very well? This quiz might tell you that, but make sure to not trust it as a definitive answer for the question: its author may have made mistakes while creating it, the quiz does not cover all aspects of English grammar, and grammatical rules are not set in stone.