What are Modal Verbs for Permission and Possibility?
Modal verbs express permission and possibility with different shades of formality and likelihood. 'Can' and 'may' request or grant permission ('Can I leave?' vs 'May I help you?'), while 'might' and 'could' express possibility or uncertainty ('He might arrive late'; 'She could be right'). Understanding these distinctions avoids awkward phrasing and shows language awareness.
Permission modals: 'can' (informal), 'may' (formal). Possibility modals: 'might' (lower likelihood), 'could' (neutral, often permission too). Each fits different contexts and shows the speaker's confidence level.
- •Can I go? (informal request)
- •May I help? (formal offer)
- •You can leave (permission granted)
- •She may stay late (formal permission)
- •It might rain (low certainty)
- •He could be late (possibility)
- •They might not know (uncertain)
- •She could have forgotten (uncertain past)
Step-by-step worked examples
Choose the right form for formality: '___ I use your phone?' (formal, asking teacher)
Context: formal (teacher) Function: permission request Correct form: May Result: May I use your phone? (polite, formal)
Express low possibility: 'She _____ be at the office; I'm not sure.'
Context: expressing doubt, low certainty Function: possibility Correct form: might Result: She might be at the office; I'm not sure.
Grant casual permission: 'Sure, _____ I help you with that?'
Context: informal (friend, casual) Function: permission offer Correct form: can Result: Sure, can I help you with that?
Flashcards
Quick quiz
Q1.Formal request for permission: '___ I ask a question?'
Q2.Express possibility: 'It _____ rain this afternoon.'
Q3.Which is correct for informal permission: 'Can I use the bathroom?'
Q4.'She _____ have called, but I didn't hear my phone.'
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Common mistakes
Using 'can' in formal situations: 'Can I borrow your car?' (to your boss). — Correct: Use 'may' formally: 'May I borrow your car?' Shows respect.
Confusing 'might' with 'will': 'He might come' doesn't mean he will definitely come. — Correct: 'Might' shows uncertainty; 'will' is certainty. 'He might come' = possibly; 'He will come' = definitely.
Using 'could' only for ability: forgetting it also means permission and possibility. — Correct: 'Could' has three uses: ability ('could swim'), permission ('could I go?'), and possibility ('could be true').
Over-using 'may' in casual speech. — Correct: Reserve 'may' for formal contexts. Casual speech: 'Can I...' or 'Could I...?'
FAQ
What is the difference between 'can' and 'may'?
'Can' requests permission informally; 'may' requests it formally. Use 'may' with authority figures (teachers, bosses).
How do you express possibility in English?
Use 'might' or 'could': 'It might rain' or 'It could rain.' Both mean it's possible but uncertain.
Can 'could' mean possibility?
Yes. 'She could be right' = 'She might be right.' 'Could' is versatile: ability, permission, and possibility.
When do you NOT use 'may' for permission?
In casual, informal contexts. Among friends: 'Can I borrow your pencil?' is natural; 'May I?' sounds stiff.