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to express ability or lack of ability in the present or future, to request permission
to express possibility, to request for permission.
strong possibility in the present of future
a possibility in the present or in the future.
a possibility in the past [followed by have done],
options, possibility, ability in the past
to express obligation, to express strong believe, necessity, logical conclusion
go before the noun.
go after the after the noun.
come after either a verb or a preposition.
are used when the complement of the verb is the same as the subject.
is used as substitute for proper and common nouns.
John, Mary, England,London, Ford, Sony, McDonalds, January Sunday, War and Peace, Titanic
man, boy, woman, girl, country, town, company, shop, restaurant, month, day of the week, book, film
should, supposed to
to give advice, to request or offer, in if- sentences.
She might go to class.
They have no -s in the third person singular [he, she, it].
Gallaudet should build a new computer center.
Most modal verbs, except for ought, are followed by the verb without to.
My teacher can sign well.
Modal verbs have no infinitiveor -ing form.
They make questions and negative forms without using do/did:
May I see that?/You mustn't shout.
I could run a long way when I was younger.
Note that some modal verbs appear to have past tense forms [could, should, might], but these are not usually used with a past meaning. One exception is could which, when talking about ability, is …
I may have seen him yesterday.
Most modal verbs can be used in some of their meanings with a perfect infinitive to talk about the past:
I + can + sleep six hours tonight.
Subject + modal + second verb. [Never add -s, -es, -ed, or -ing to the second verb.]