A good number of questions have come up when entering answers and trying to understand the concept behind the て-form. But to try to keep it concise:
When asked for “(please) don’t” that should be ないで, so even though ください can be omitted. When entering an answer for “I’m sorry for not” or “must do” that should start with なくて and it currently considers ないで as being incorrect (at least in the “sorry not” instance).
Should we consider ないで more of “don’t” and treat it as a different substance altogether from なくて ? Is it even relevant to understand the concept of “negative-て” as opposed to the various usages of て-forms? (EDIT: yes, it’s important and has a concept and usages, but it feels like something isn’t clear at all).
Thank you very much!