Modal Verbs.

https://www.youtube.com/watch?v=Ckl_XQDDQqs

Modal verbs are auxiliary verbs that can not function as a main verb, unlike the auxiliary verbs "be", "do" and "have" that can function as a main verb.

Modal verbs express modality, ability, possibility, need or other condition. We use them for the future and the conditional. As complementary verbs that are, modal verbs do not work without another verb. This other verb always goes after the modal verb and is in the base form (the infinitive without "to"). Modal verbs are not conjugated and do not have time. Modal verbs are: 
      can
 could
 may
 might
 will
 shall
 should
 ought to
 must/have to
 would
https://www.englishgrammar.org/modal-auxiliary-verbs-exercise-6/

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