Modal verbs

Modal verbs are a kind of verbs that behave differently than the other verbs. These are some of them:

Can Could
May Might
Must Should
Shall

-Can:
The modal verb Can expresses the ability to do something or the possibility that something happen.

I can play football it expresses the ability.
You can go out! it expresses the authorization.
Can you help me? it expresses a request.

-Could:
The modal could is the past of can, it has the same behaviour of can. But sometimes it expresses the conditional (If I had a drive license, I could drive).

I could play football could=was able.
If I had a drive license, I could drive it expresses the conditional.
Could you help me? it expresses a request.

-May:
The modal verb May expresses a prediction or something that can be true.

It may rain that’s a prediction
This news may be true
May I tell you somthing? ask for a permission

-Might:
Might is the past of May, it has the same meaning of it. (The news might be true)

-Must & Should:
Must and Should are used to express: an obligation, an advice or a prohibition. Generally, we use Must for something necessary, and Sould for something advisable.

You should see a doctor it expresses an advice.
You must see a doctor
You must do your homework it expresses an obligation.
You must not smoke here it expresses a prohibition.

-Shall:
It’s usually used in a question? It expresses an offer or a suggestion.

Shall I help you? an offer
Shall we go to the supermarket? a suggestion
Shall we go by car? a suggestion
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