Auxiliary “（）” is usually used to help the main verb to express negative meanings or to form questions, and sometimes to help express the emphatic affirmative.
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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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Auxiliaries fall into three categories: （） auxiliaries, modal auxiliaries and semi-auxiliaries.
The function of auxiliary “（）” is to help the main verb to form the perfective or the perfective progressive aspect.
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