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The present perfect is used when the time period has not finished: |
I have seen three movies this week.
(This week has not finished yet.) |
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The present perfect is often used when the time is not mentioned: |
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Gerry has failed his exam again. |
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The present perfect is often used when the time is recent: |
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Ikuko has just arrived in Victoria. |
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The present perfect is often used with for and since. |
Greg has lived here for 20 years.
Greg has lived here since 1978. |
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The present perfect is formed like this: |
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have plus past participle |