Modal verbs (such as can, could, shall, should, will, would, may, might, and must) combine with verbs in the bare infinitive to express information about the verb such as possibility or necessity.

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about 'need' and legal requirements

I saw the following question. It is puzzling not because of the grammar, but the meaning of 'need': In the past we threw a lot of our kitchen waste away, but today many itmes such as plastic bottles ...
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Inverted conditional sentence using 'can' and 'will'

On this page in Wikipedia!, it states for first conditional sentences: The condition can also be expressed using the modal verb should. This form can be used to make an inverted condition ...
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Mustn't be doing something

Do the following sentences have a deontic or epistemic meaning? He must be studying now. He mustn't be studying now.
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Modal-verb ellipsis

I have two questions about modal-verb ellipsis. Can we omit the boldfaced modal verb in (a), without changing the meaning of the sentence? Which sounds more natural, (a) or (b)? (a) The delegation ...
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Can 'must' be used in a negative question?

Is it proper to write negative questions this way? You mustn't watch too much TV, must you?
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Why is “that would be me” more certain than “that is me”?

I have been reading these two posts on would: Why "that would be me"? (part 1) & Why "that would be me"? (part 2) If you want a domestic SUV, then the best choice would be the Ford Escape ...
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“must”: obligation x certainty. Which meaning developed first in the English language?

ORIGIN OF MUST - Middle English moste, from Old English mōste, past indicative & subjunctive of mōtan to be allowed to, have to; akin to Old High German muozan to be allowed to, have to First ...
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Use of Modal Verbs 'Must' and 'Will' to Express Certainty

When I see examples of 'must' or 'will' showing certainty, I find that the main verb is either a stative verb or a present participle preceded by 'be'. How different are the two sentences in the ...
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Contracting “I should have” to “I'd've”

I know that for "I would have" the contraction "I’d have" or "I’d’ve" is a lot more frequently used in everyday conversation. But is the same true for "I should have"? Is "I’d've" also prefered?
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Ability vs. General Ability in the Past

There is a rule in English that we don't use 'could' to express someone's ability to do something at a particular time or in a particular situation in the past. We use other expressions e.g. be able ...