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  1. English grammar: Modal Verbs: can, could, may, might, should, ought

  2. Modal Verbs: Definition & Usage Examples | Grammarly Blog

  3. Modal verbs | LearnEnglish - LearnEnglish - British Council

  4. Modal Verbs: Can, Could, May, Might, Must, Should

  5. Modals: permission and obligation | LearnEnglish - British Council

  6. Difference between Should and Must | Should vs Must - BYJU'S

  7. Modal Verbs in English Grammar - Lingolia

  8. Explanation and use of English modal verbs (can, must, may)

  9. Difference between should, must, can, may [duplicate]

  10. English Modal Verbs Can, Could, Should, May, Might, etc.