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The three main uses of Can are:

Ability

Possibility

Permission

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"Birds can fly"

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Can I ask you a question?

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I know you can win the competition"

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Could is similar to Can and often replaces Can in the past tense.

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I could ride a horse when I was younger

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Could I please use your bathroom?

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He couldn't go to the concert because his mother wouldn't let him.

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They can normally be interchanged without a significant difference in meaning.

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I might go to the movies tonight.

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If you have finished the exam, you may leave the room

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May I borrow your pen?

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Should is a modal verb.
After Should you use the base form of the infinitive

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Your hair is too long. You should get a haircut.

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Expresses that a situation is likely in the future (prediction)

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Expresses that a situation is likely in the future (prediction)

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They should win the game

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Expresses an obligation that is not as strong as Must

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Expresses an obligation that is not as strong as Must

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You should never lie to your doctor

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We normally use WILL to speak about the future. It is always combined with another verb.

Since WILL is classified as a modal verb it has the same characteristics:

It does not change in the third person (i.e. he, she, it)

It is always combined with another verb in the base form (i.e. without 'to')

We don't use it with 'Do' in questions or negatives.

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I'll call a taxi for you

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When we think or believe something about the future.

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When we think or believe something about the future.

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I think you will find the movie interesting

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To make an offer, a promise or a threat.

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To make an offer, a promise or a threat.

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If you say anything I will kill you!

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Would is often used in conditional sentences with a clause beginning with "If..." but it can also be used in the following situations

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Would you like some more tea?

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Nobody would believe me if I told them I had seen a UFO

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Before internet people would send letters to each other.

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Must is a modal verb
It is prohibited; it is not allowed. It is important than you do NOT do something.

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People must remain seated until the show is over.

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You must drive carefully.

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The ice cream here is delicious. You must try some