E4 - To Perfect Or Not To Perfect

Artёm and Casey discuss two tenses that are a source of much tension in the world of English learning - the past simple and the present perfect. What's really going on here? How do Americans use these tenses compared to Brits? Is it a mistake if you say "I just ate lunch" instead of "I've just eaten lunch" (spoiler alert: it's not)? Music: The Sound Spa