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Tenses
The Present Perfect connects a past action or experience to the present moment. Use it when the exact past time is unspecified, when the result of the action matters now, or when describing life experience. It is formed with have/has + past participle.
Affirmative
S + have / has + past participle (PP)
Negative
S + have not (haven't) / has not (hasn't) + PP
Question
Have / Has + S + PP + ?
Continuous
S + have / has + been + V-ing (focus on ongoing duration)
I have seen him yesterday.
I saw him yesterday.
She has worked here since three years.
She has worked here for three years.
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