Auxiliaries fall into three categories: （） auxiliaries, modal auxiliaries and semi-auxiliaries.
正确答案：primary
Auxiliaries fall into three categories: （） auxiliaries, modal auxiliaries and semi-auxiliaries.
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What is the tense and aspect of the following sentence?I was sitting in the classroom.
Auxiliary “（）” is usually used to help the main verb to express negative meanings or to form questions, and sometimes to help ex
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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.
- A （） verb phrase is a main verb preceded by an auxiliary or auxiliaries and it may also contain modifiers.