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How to use English Modal Verbs  |  Possibility & Probability

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Mr. Bean’s TV Breaks - Buys a New One - Modal Verbs

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The student will practice modal verbs, especially the modals of obligation: should, have to, must.

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Modal verbs can be used to express:
(Click in each category if you have any question or doubt)
Probability,    Ability,    Permission,    Requests, offers and invitations,    Suggestions and obligations.

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Have to / don't have to
Even though have to is often grouped with modal auxiliary verbs for convenience, it's not a modal verb

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Each modal verb has its negative form.
Never use Don't, Doesn't, isn't, didn't, before a modal verb.

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Ought to / Ought not to
Not very common, people usually use should or should not.
Have to

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You can't an must not use the preposition "to" after a modal verb