Study this example situation:

Tom is looking for his key. He can't find it.
He
has lost his key.
He has lost his key = He lost it recently, and he still doesn't have it.
Have/has lost is the present perfect simple:
I/we/they/you | have (= I've etc.) | finished lost done been etc. |
he/she/it | has (= he's etc.) |
The present perfect simple is have/has + past participle. The past participle often ends in -ed (finished/decided etc.), but many important verbs are irregular (lost/done/written etc.).
For a list of irregular verbs, see Appendix 1.
When we say that 'something
has happened', this is usually new information:
- Owl I've cut my finger.
- The road is closed. There's been (there has been) an accident.
- (from the news) Police have arrested two men in connection with the robbery.
When we use the present perfect, there is a connection with
now. The action in the past has a result
now:
- 'Where's your key?' 'I don't know. I've lost it.' (=I don't have it now)
- He told me his name, but I've forgotten it. (= I can't remember it now)
- 'Is Sally here?' 'No, she's gone out.' (= she is out now)
- I can't find my bag. Have you seen it? (= Do you know where it is now?)
Note the difference between
gone (
to) and
been (
to):
- James is on holiday. He has gone to Italy. (= he is there now or on his way there)
- Jane is back home now. She has been to Italy. (= she has now come back)
You can use the present perfect with just, already and yet.
Just = a short time ago:
- 'Are you hungry?' 'No, I've just had lunch.'
- Hello. Have you just arrived?
We use
already to say that something happened sooner than expected:
- 'Don't forget to pay your electricity bill.' 'I've already paid it.'
- 'What time is Mark leaving?' 'He's already left.'
Yet = until now.
Yet shows that the speaker is expecting something to happen. Use
yet only in questions and negative sentences:
- Has it stopped raining yet?
- I've written the email, but I haven't sent it yet.
You can also use the past simple (
did,
went,
had etc.) in the examples on this page. So you can say:
- 'Is Sally here?' 'No, she went out.' or 'No, she's gone out.'
- 'Are you hungry?' 'No, I just had lunch.' or 'No, I've just had lunch.'