We have recently came across the topic of question tags at our lesson and at school my teacher isn't a native speaker and said herself she doesn't know, so that's why I'm asking here.
If I say "I'm lazy, aren't I?" That should be grammatically correct based on my textbook. They wrote there that "I'm lazy, am I not?" doesn't exist, it's incorrect. However, I found on the internet a few discussions where people used it. Another one said that it sounds just really old.
Is it really grammatically incorrect or just old? Or it depends on the region? I'll be glad if you express your opinion because I'm really curious. I think I'll still write "aren't I?" in the exams, just to be safe ... 😁