Thank you Jon 😊👍

Totally agree with Emily. My immediate reaction was also "can you really not have seen anybody?" but I find it difficult to imagine the situation where you would use that phrase in preference to "have you really not seen anybody?"

Thank you Emily for your thorough explanation. It's my second day here and that's why I don't know how to answer correctly so you can see it. Thaaaaank you so much 😍

Hi! I think the correct way of saying this would be 'Can you really not have seen anybody?' but to be honest I think a different way of wording it would sound more natural/native. 'Haven't you seen anybody' is also grammatically fine, but it depends on the meaning If I understand correctly, are you asking someone if they have seen anybody, and they have said no, and you're asking again to make sure because you don't believe that they haven't seen anybody? If I'm right, then I think an English speaker would just say 'Have you really not seen anybody?' or if you're confused as to how they couldn't have seen anybody and you don't believe them, you could say 'how could you not have seen anybody?'