Please do not forget.
お忘れなく
忘れる.
度忘れ.
忘れようよ!
I will make a note of it,―make a memorandum of it,―so that I may not forget.
Don't forget your bag.
忘れずにやってよ。
忘れずにやってよ。
Do it without forgetting.
I'll try to remember that.
I'll try not to forget.
忘れっぽくなる.
Don't forget your money.
You must not forget.
I will make a note of it, so that I may not forget.
Don't forget to visit.
Please see that you leave nothing behind.
忘れちまえ!
Please write it in full.
Don't forget to sign your name.