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