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Formation: 'HAVE' + Past Participle
1/ Use the present perfect (not the past simple or the present simple) to talk about an action that began in the past but is still relevant now.
- I've worked here for four years.
- I've missed my flight.
- She's broken her leg and cannot go on holiday next week.
2/ Use the present perfect (not the past simple) for past actions when the time is not specified.
- Have you ever been to Rome?
- I've never been to Kyoto.
- Have you seen this film?
3/ Use the present perfect (not the past simple) to talk about recent past events, often with just, already, and yet.
- I've just seen Stefan.
- We've already told him.
- Haven't you finished your homework yet?
4/ Use for to say how long an action has been going on and since to say when the action started.
- They've lived in P.N.G. for two years.
- He's had a cold since Monday.
Aspect; Past Perfect; Verb; Perfect