Mastering English Modal Verbs and Advanced Lexis
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Mastering English Modal Verbs and Usage
This section clarifies the meaning and context for essential modal verbs and related expressions concerning necessity, obligation, possibility, and ability.
Modal Verbs for Obligation, Necessity, and Rules
- MUST: Expresses strong certainty, obligation, or essential requirement. (I'm sure, I'm certain, is obligated to, essential that, it's compulsory, needs, needs to be, it's necessary for, rule.)
- HAVE TO: Expresses external obligation or necessity. (Is obliged to, it's essential that, it's compulsory.)
- MUSTN'T: Expresses prohibition or danger. (It's forbidden that, not permitted/allowed, dangerous.)
- DON'T HAVE TO / DOESN'T HAVE TO: Expresses lack of necessity. (It isn't necessary.)
- HAD TO: Expresses past necessity.