A modal word is one that demonstrates the mode or form of an action. Examples of sentences that can be made from the modals given in the question above are;
As seen in the sentences above, the modals demonstrate the form of an act. 'Must,' for instance strongly incites a person to take an action.
'Can' shows the ability of a person to perform an act. 'May' is a conditional sentence.
All of these modals indicate the mode or form of the actions performed by the subjects.
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