We use modal verbs to show if we believe something is certain, probable or possible (or not).

We also use modals to do things like talking about ability, asking permission making requests and offers, and so on.

Modal verbs can often be used with ‘have’ to refer back to a time in the past, or the present, or in the future.

The main modal verbs are:
Can
Could
May
Might
Shall
Should
Will
Would

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