Identifying a Correct Sentence

It was mid 9 week common assessment time and my students are still having a hard time identifying a correct sentence. I feel like I can't get them to slow down and look for all the parts to a sentence. I created this sort as a reteaching tool. Will be doing it this week! http://www.teacherspayteachers.com/Product/Sentence-Sort-Identify-a-Correct-Sentence-1436778