1. He has never played golf. (BrE)
He never played golf. (AmE)
2. She has written 5 letters this morning.
3. I have just finished my homework. (BrE)
I just finished my homework. (AmE)
4. I have already read this book. (BrE)
I already read this book. (AmE)
5. Have you written a letter to your aunt yet/already? (BrE)
Did you write a letter to your aunt yet? (BrE)
I to by było na tyle. :)
Zdania 1,4,5 w AmE także można wyrazić przez Present Perfect.