Present perfect tense is a verb form that is used to express the experience of the past, changes in the information, activity or situation that has started in the past and have not finished now, and the events that just happened.
FORMULA PRESENT PERFECT TENSE
positive (+) S + aux. verb(have/has) + V-3/past participle
negative (-) S + aux. verb(have/has) + not + V-3/past participle
introgative (?) aux. verb(have/has) + S + V-3/past participle
.)Have used for I, you, they, we, while has to he, she, it, and the third person singular.
.)Verb-3 used the Transitive and intransitive.
.)Changes in Verb-3 refers to the regular and irregular rules.
>Present perfect tense to express the experience of the past no matter when exactly happened.
>Present perfect tense to reflect changes or new information.
>Present perfect tense to disclose any activity or situation that started in the past and then continued to the present or unfinished (state).
>Present perfect tense to discuss the events that had just happened.