English modal verbs may sometimes bring some ambiguity into the classroom because of the different meanings they have. To make things easier teach modal verbs separately. Previously we have written some articles where you can find activities to practice modals of obligation, ability, deduction and the modal verb should. If you have already covered all these modal verbs with your teachers, send them the following test to check their knowledge. The test is suitable for pre-intermediate levels.
Modal Verbs (test)