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'Used to' is a ‘marginal’ modal verb used to describe an activity or a state that happened many times in the past. It also used to refer to an activity or state that was true in the past but is no longer true.
'Used to' express states / habit / routine / change of the past.
'Used to' expresses the idea that something was an old habit that stopped in the past. It indicates that something was often repeated in the past, but it is not usually done now.
"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.
