n the English language, a modal auxiliary verb is an auxiliary verb (or helping verb) that can modify the grammatical mood (or mode) of a verb. The key way to identify a modal auxiliary is by its defectiveness; the modal auxiliaries do not have participles or infinitives.
The modal auxiliaries are as follows:
    * will and would
    * shall and should
    * may and might
    * can and could
    * must and have to
    * ought to and had better
    * in more archaic use, dare and need
    * by some accounts, do
Each of these is treated here separately.
 
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