You need not buy any.Can, could and be able to are used to express a variety of ideas in English: Ability/Lack of Ability Present and Future:Īm / is / are / will be + able to + base form of the verbĪm not/ isn’t / aren’t/ won’t be + able to + base form of the verb There are a lot of tomatoes in the fridge.You must stop when the traffic lights turn red.Modal verbs are followed by an infinitive without "to", also called the bare infinitive. had better advice You'd better revise your lessons Remember advice You should / ought to revise your lessons logical conclusion He should / ought to be very tired. should/ought to 50 % obligation I should / ought to see a doctor.
There are plenty of tomatoes in the fridge. need not lack of necessity/absence of obligation I need not buy tomatoes. polite permission Excuse me, could I just say something? possibility It could rain tomorrow! may permission May I use your phone, please? possibility, probability It may rain tomorrow! might polite permission Might I suggest an idea? possibility, probability I might go on holiday to Australia next year. could ability in the past When I was younger I could run fast. permission Can I use your phone, please? possibility Smoking can cause cancer. must not prohibition You must not smoke in the hospital. logical conclusion / Certainty He must be very tired. Here is a list of modals with examples: Modal Verb Expressing Example must Strong obligation You must stop when the traffic lights turn red. Modal verbs are used to express functions such as:
The verbs or expressions dare, ought to, had better, and need not behave like modal auxiliaries to a large extent and may be added to the above list Use of modal verbs: Here is a list of modal verbs: can, could, may, might, will, would, shall, should, must
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