Possible Duplicate:
When is the present perfect tense used instead of the past tense?
When will “Present Perfect vs. Past Tense” cases be affected by culture?
I feel like I often misuse Simple Past and Present Perfect.
For example, given this sentence:
I already asked her.
Asking her is something I have done... but it's also something I did. So would it be more correct to use Present Perfect, as in:
I have already asked her.
Or are they interchangeable?