i forget wheter i (have)seen him before.为什么不能用had?

i forget wheter i (have)seen him before.为什么不能用had? 改错I had a dream to write for others to read what I have written,wheter it is poetry or stories wheter错在哪里 I cannot forget Can I forget I do not forget how can i forget I want to forget I wanna forget I must forget you. i never forget I forget who forgive I must forget i alawys forget to forget you I could not forget I could not forget Whatever I do,I always forget to forget i continue to forget i will slowly forget I want to forget everything I want to forget everything Someone something ,I never forget.