This leads me onto an activity I've been doing with my students as revision preparation (but really you can use it any time). Recently my students have been struggling with more complex sentence structures, leaving out prepositions and articles. I've also noticed they are getting a little muddled with their tenses, or forgetting certain tenses. I decided to go through all of their books and pick out sentences they had written incorrectly and type them onto cards, along with a few of my own.
I split my class into two teams (girls versus boys, as we had an equal number, but you can choose to do this how you wish). In teams the students had to read the sentence and re-write it on a white board in under 1 minute. I used a sand timer to add the pressure and make it more fun. If the students got the sentence correct they were then allowed to throw a paper plane at the whiteboard which had a target with different points on. The students loved the game and wanted to keep playing. It's a great activity to go over error corrections and less intrusive for students.
NB: You could add in a cross curricular purpose to this activity by having a target board which gets students to add up the numbers, to see how many points they have.