Modal verbs are helping verbs expressing the degree of possibility, ability, permission, or obligation. Let's take a look at modal auxiliary verbs with their uses and examples below.
    
Modal verbs are auxiliary or helping verbs. These kinds of verbs cannot be used on their own and appear in connection with a main verb.
	The most common modal verbs are:
	     can         could  
	     may        might  
	     shall       should
	     will         would
	     must       ought to
Modal verbs affect the main verb they are associated with by expressing the level of possibility, ability, permission and obligation for that action or state.
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