Here are some games that will help you with your grammar skills. Some of these sites were made in England and therefore the spelling and vocabulary may look different to you. I had a lot of fun practicing with these sites.
Mrs. Ladd

Blabberize- use to speak for a character or animalA Talking Animal

Glogster- a way to show what you know making a poster

Sentence/Not a Sentence? Sentence Practice

This site may help you with parts of speech.
Parts of Speech

This site lets you generate your own tale.

Daily Writing Prompts