Does your course contain enough grammar on its own, or would I need to supplement it?

Yes, there is sufficient grammar covered within our courses, and there’s no need for any additional grammar curriculum.

However, if you want your child to know how to diagram sentences, you should consider adding a course that teaches diagramming skills. The grammar portion of Essentials in Writing includes the basic parts of speech, but focuses on teaching students how to use certain parts of speech as tools to communicate more effectively with the reader rather than how to diagram sentences.