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'Need' used as a semi-modal and main verb mostly in the negative form. As a modal verb it expresses absence of obligation or necessity and As a main verb it indicate that there is necessity to do something.
'Need' can be used as an ordinary/normal/main verb and an auxiliary or semi-modal verb.
'Need' used as a semi-modal and main verb because in some ways it is like a modal verb and in other ways like a main verb. We use need mostly in the negative form to indicate that there is no obligation or necessity to do something. It can be used as an normal verb (with 'to') and an auxiliary verb (without 'to').
"Auxiliary-cum-verbs" are :
These 11 auxiliaries are also used as verbs, therefore, they are called Auxiliary–cum–verbs.
These are used to form Tenses. ( Please refer Tense Table).
"Pure Auxiliary verbs" are :
These 20 auxiliaries only support normal verbs, therefore, they are called Pure Auxiliary Verbs. They are also called Models or Model Auxiliary Verbs.