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Modals Summary Function Ability
Modal Can
Present I can speak 3 languages
Obligation
Must, have to
Drivers {must/ have to} stop at a red light.
Prohibition Mustn’t Advice
Should, ought to,
Criticism
Should(ought to) have done
Lack of obligation
Needn’t = don’t ( doesn’t) have to
Deduction
must
Impossibility Can’t Possibility
May, might, could
Students mustn’t cheat in exams You {should/ought to } study hard
There are only few guests. We { neednt / don’t have to } buy many cakes He has Rolls Royce. He must be rich.
Past When I was a child I could run fast They had to stop at a red light
Explanation be able to , know how to It is obligatory to
it is forbidden to, it is against the law It is advisable, it is a good idea You { should/ought to }have Somebody did something tried better (but they didn’t wrong in the past try and their team lost) You needn’t have bought It is not necessary to do cakes ( it wasn’t necessary , but you bought them)
I can’t have access to the internet. My father must have changed the password. He can’t be American, His He can’t have written the English is terrible. poem. He is illiterate. It is cloudy. It{ I guess it {may/ could/ may/could/might } rain might} have been Lucy on the phone.
I am sure ,I am certain
I am sure someone/ something is not It is possible/perhaps
Modals Summary Function Ability
Modal Can
Present I can speak 3 languages
Obligation
Must, have to
Drivers {must/ have to} stop at a red light.
Prohibition Mustn’t Advice
Should, ought to,
Criticism
Should(ought to) have done
Lack of obligation
Needn’t = don’t ( doesn’t) have to
Deduction
must
Impossibility Can’t Possibility
May, might, could
Students mustn’t cheat in exams You {should/ought to } study hard
There are only few guests. We { neednt / don’t have to } buy many cakes He has Rolls Royce. He must be rich.
Past When I was a child I could run fast They had to stop at a red light
Explanation be able to , know how to It is obligatory to
it is forbidden to, it is against the law It is advisable, it is a good idea You { should/ought to }have Somebody did something tried better (but they didn’t wrong in the past try and their team lost) You needn’t have bought It is not necessary to do cakes ( it wasn’t necessary , but you bought them)
I can’t have access to the internet. My father must have changed the password. He can’t be American, His He can’t have written the English is terrible. poem. He is illiterate. It is cloudy. It{ I guess it {may/ could/ may/could/might } rain might} have been Lucy on the phone.
I am sure ,I am certain
I am sure someone/ something is not It is possible/perhaps