Why is the "I did not bring notebook." is not correct? There is no clearly seen "my" in original sentence.
You need an article so "I did not bring a notebook" could be correct but the "my" is implied here.
Why doesn't Duolingo accept perfect forms? Why is "I haven't brought the notebook" incorrect?
And "I have not brought my notebook"
That would be 我没有带‘过’笔记本。If the 过 isn't there 9/10 times its not a perfect form sentence.