perfective

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perfective

1.The “（）” use of the present perfective denotes that an action or state extends over a period lasting up to the present moment, p2.The past perfective when used to express hypothetical meanings is called the imaginary use of the past perfective.3.The past perfective progressive and the past perfective can be used interchangeably in many cases.4.The function of auxiliary “（）” is to help the main verb to form the perfective or the perfective progressive aspect.5.The past perfective progressive is made up of had been + -ing participle.