Any word that denotes an action is Verb. Hence verb is also called "Doing Word".
A verb can be classified into two categories.

• Helping Verb are of two types:- 
• Modals - Do not act as main Verb. For eg. can, could, may, etc. Note: 'Need','Dare' and 'used to' act as marginal auxiliary verbs; 'need' and 'dare' act as both main verb and modal.
• Primary Auxiliary Verb - (Be, Do, Have) They act as both helping verb and main verb.
• Main Verb - The word that expresses an act or occurrence. A main verb is sometimes preceded by an auxiliary verb.

'Used to' acts as both 'modal' and 'adjective'.

•  Auxiliary Verbs: They are used in addition to other verbs. These are also called helping verbs.
• Modal Auxiliary Verbs: They are also called helping verbs. can, could, may, might, shall, will, would, should, must and ought to are called Modal Auxiliary verbs.

• Marginal Auxiliary Verbs: Used to, need and dare are Marginal Auxiliary verbs. These modals can be used as a main verb(Need & Dare) or an adjective (Used to) in a sentence.
• E.g: 1.
• (a). I am used to sleeping late at night.("am" is Helping verb "Used to" is Adjective and sleeping is Gerund)
• Example Type 2
• (a). I need you.("need" is main verb)
• (b). You need not come tomorrow.(Here, "need" acts as a Helping verb and "come" Direct infinitive)
• Example Type 3
• (a). She does not dare to come home late.("dare" is Main Verb and "to come" infinitive)
• (b). I dare not enter his room without permission.(Here, "dare" is Helping verb and enter is Direct infinitive)

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