This five page modal and semi-modal auxiliary verb product can be used as practice, homework, or quiz for fourth grade. The core standard covered is L.4.1c. It would also be a good review for fifth grade.
This is a tricky area of grammar, so kids can't get too much practice. It will not replace your great teaching but will be a support to help.
There are 20 questions with an answer key. Additionally, I included a modal verb reference chart for students to keep in their notebooks.