STRUCTURE:
Affirmative: (pro)noun + have, has + past participle
I have finished my work.
Negative: (pro)noun + have, has + not + past participle
I haven't finished my work.
Have you finished your work?
USE
1. We use present perfect tense for actions which started in the past and still continue in the present:
He has worked as a doctor since 1990.
2. Actions which have recently finished and their results are still visible:
I have broken my arm.
3. Experiences:
He has tried rock climbing.
He has worked as a doctor since 1990.
2. Actions which have recently finished and their results are still visible:
I have broken my arm.
3. Experiences:
He has tried rock climbing.
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