Master English Grammar: From Modals to Tenses
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Unit 8: Modal Verbs
Modals of Ability
- Can, Could, Be Able To - Express ability
Modals of Permission
- Can, Be Allowed To, Could - Express permission
Modals of Advice
- Should, Ought To - Give advice and make recommendations
- Had Better - Give advice, express intentions, and make warnings
Modals of Necessity, Obligation, and Prohibition
- Must - Express obligation
- Mustn't - Express prohibition
- Have To - Express obligation
- Don't Have To - Express no obligation
- Needn't - Express no obligation
Modals of Possibility and Certainty
- May/May Not/Might/Might Not/Could - Express possibility (present and future)
- Can't - Express that something seems impossible
- Must - Express certainty that something is true
Modals + Perfect Infinitive
- Might/May/Could + Have + Past Participle - Express