I didn't say they were DOUBLE negatives

I was changing the subject just a little when I said, 'However, their still remains a huge issue with negatives', before introducing tag questions.

You are correct in that tag questions are a request for affirmation. However, my point was simply that when a NES requests affirmation by using a negative statement followed by a tag question, Chinese NES have a tendency to confirm the statement, rather than answer the tag question.

They simply follow the Chinese pattern, but answers such as 'Yes, we won't' are often confusing to NES