The function of auxiliary “（）” is to help the main verb to form the perfective or the perfective progressive aspect.
正确答案：have
The function of auxiliary “（）” is to help the main verb to form the perfective or the perfective progressive aspect.
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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
Main verbs can be divided into transitive verbs, （） verbs and linking verbs in accordance with whether or not they must be follo
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- The “（）” use of the present perfective denotes that an action or state extends over a period lasting up to the present moment, p
- The past perfective when used to express hypothetical meanings is called the imaginary use of the past perfective.
- The past perfective progressive and the past perfective can be used interchangeably in many cases.
- The past perfective progressive is made up of had been + -ing participle.