If you need some extra exercises about Modal Verbs, you can click on the following links. Then, you can download all these worksheets with key answers. Good luck!!! We find at the very end of this academic year!!!
2. alvarofronteacher.wikispaces (exercises + key answers)
3. Rephrasing Modals (sentences + key answers)
4. Burlington Books (exercises + key answers)
4. maristasjaen.es (reprhasing modals)
5. mbonillo.xavierre.com (online exercises)