關於Wiile的意思和用法的提問

A: The looking at your phone is fine and could be "using your phone" or "watching stuff/videos on your phone" would be fine too, but the "It's not done" is a little bit unnatural to me. The standard (though rather posh) expression is "It is not the done thing," and I would use that. It is a useful expression since it is much milder than "impolite" "rude."

It's not the done thing to eat while looking at/using your phone.

I would use "using."