We have a variety of worksheets on grammar and paragraph composition. The first three I linked to are on composition: how to write a good opening sentence, organizing your thoughts for writing, and a basic worksheet on how to structure a paragraph. The last link is our fourth grade grammar worksheets, where you'll find a good selection of worksheets on commas, conjunctions, capitalization, etc. If you need something easier or harder, just change the grade in the dropdown. Good luck!