auxiliaries

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auxiliaries

1.There are three primary auxiliaries: “be”, “do”, and “（）”.2.Semi-auxiliaries constitute a category of verbs between auxiliaries proper and main verbs.3.The past tense forms of auxiliaries do not necessarily express past time.4.Auxiliaries fall into three categories: （） auxiliaries, modal auxiliaries and semi-auxiliaries.5.A （） verb phrase is a main verb preceded by an auxiliary or auxiliaries and it may also contain modifiers.