The main function for the present perfect tense is to relate something in the past to the present. We can do so in a number of ways. First, we have indefinite past actions. 'I have been to Italy twice'. We're not concerned with when it happened, we just simply want to say that it has happened in the past. It's a fact of something I have done in the past but yet it's still true in the present. Unfinished past actions: 'I have lived here for three years'. I started living here in the past and it's still true now. With this usage, you will typically see time expressions. Finally, we have past actions with present results. I have lost my keys. It's implied that I still haven't found them. I lost them in the past. I don't have them now. I've lost my keys.
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