Why should we answer your question when you haven't answered mine in post #11 here?
Student or Learner
A: The earth is flat.
B: Who did say it?
A: Our class teacher.
B: He didn't say it.
Can I replace "He didn't say it" with "He didn't say so"?
For info, that question has now been answered on the original thread.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.