Possible Duplicate: “Did it close” vs “Has it closed”? Which is correct: “has died” or “died”? How do the tenses in English correspond temporally to one another? ...
I was unable to find out the rules here and what is the difference: As yet, he has not received the package. As yet little was known of the causes of the disease.
Is there any difference between these two sentences? Mirek went to Europe on business. Mirek has gone to Europe on business.
I know there are differences between American and British English in this area. So when answering, please specify whether you speak American or British English.