I found this fun post over on We are Teachers. It talks about 10 common grammar mistakes and fun games and activities to help your students overcome them!
Here is my favorite:
LESSON: Drop "_____ and"
The easiest way for students to know when they should use I versus me in their sentences is to drop the "_____ and." For example, You and I went to the store versus You and me went to the store. Which sounds correct? I went to the store or Me went to the store? Another example is with a name: The dog followed Mason and I or The dog followed Mason and me. Drop "Mason and," and which sounds right? The dog followed me. To turn this into an educational activity, designate two corners of the classroom, one for I and one for me. Read a sentence using a blank where I or me should be inserted. Students go to the corner with the correct word (I or me). You could also play this on the playground so that students could run to the correct word. Write the words I and me in huge letters on the blacktop. Split your class into two teams. Two students come up at a time. After you read a sentence with the missing word (I or me), the students run to the I or me. The students who stand on the correct word get a point for their team.
Click on over to We Are Teachers to read about all the activities! Let us know which is your favorite!