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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 function of auxiliary “（）” is to help the main verb to form the perfective or the perfective progressive aspect.
- The past perfective progressive is made up of had been + -ing participle.