In English there are certain auxiliary verbs which always accompany a main verb introducing a modality of ability, permission, probability or future, suggestion or advice and obligation in the meaning of the sentence. They are different from the main auxiliary main verbs Be, Have and Do because these three verbs can function alone in the sentence as main verb with meaning (“ser / estar, tener, hacer” correspondingly) or they can accompany a main verb in order to form another tense. For example: Be: the Continuous tense (Present, Past and Future Continuous) and the Passive Voice. Have: the Perfect (Present, Past and Future Perfect), similar with Spanish “haber”. Do: forms the negative and interrogative sentences in the Present/ Past Simple tenses. The modal auxiliary verbs are immediately followed by the main verb or the particle “not” and th...
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