Modal Auxiliary Verbs

Will and Shall:

You know that WILL is used to construct the Future Tense of regular and irregular verbs.
And also to make an urgent request :

SHALL is common to make a suggestion or an offer in the form of a question:
Can/Could :

To describe ability now or in the past.:

And also, to give an explanation or ask for permission:

To express perception with certain verbs by using can in the present tense, and could in the past tense. The verbs are: to feel, hear, see:

Or, to explain a possibility and to make a suggestion in the present and future tenses by using could:

May/Might :

To express a possibility/make a suggestion at the present time or in the future.

Might suggests a little less certainty than may.

Or, MAY to give/ask for permission:

Must :

To explain obligation or strong necessity: must is used with the Simple Present and Future Tenses:

Also, to express a factual information now:
In the past you have to use "must have...".

Would :

To describe or talk about a imaginary or desired situation:

Also, to ask for or give information:

To make or accept an invitation:

Should :

To express an obligation or necessity:

Or, to give emphatic suggestions:

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