will never forget
お忘れなく
ゆめ忘るな
to forget oneself―lose oneself (in admiration)―be lost (in admiration)―be absorbed (in study)―be engrossed (in one's business)―be beside oneself (with joy or grief)
to be forgotten―pass out of mind―pass out of one's memory―fade from one's memory―escape one's memory―slip one's memory―fall into oblivion―be buried in oblivion
忘れないでよ。
to forget something
the degree to which something is difficult to forget
You must not forget.
思い出さずに
Be ever present to your mind
I never forget it for a moment.
You are ever present to my mind.