The Common Core State Standards expect students to recognize errors in subject-predicate agreement, fragments, and run ons consisting of comma splices and fusion. The three worksheets are a review of the essentials of sentence formation. Students must understand the primary components of the sentence and can recognize errors in sentence formation.
What we have here is three worksheets and the keys. They isolate the problems with
1) Subject-Predicate Agreement
2) Sentence Fragments
3) Run-Ons (Fusion and Comma Splices)
I have found most of the learning comes as we are grading the work and brushing up on the weak points with students.