Hey! Don't forget your jacket!

嘿！别忘了你的夹克！

youdao

You mustn't forget your manners.

你不能忘了你的礼貌。

youdao

I'll never forget your kindness.

我永远不会忘记您的好处。

《新英汉大辞典》

If you ever go, just don't forget your cowboy hat.

VOA: special.2009.02.16

So, remember when you're looking at your periodic table, don't forget about the lanthanides, sometimes they come into play.

因此，要记住，当你在看元素周期表时，不要忘了镧系元素，有时候也会用到它们。

麻省理工公开课 - 化学原理课程节选

but it is imperative that you do not forget things as simple as brushing your teeth.

但不要忘记像刷牙这样的小事也是必须的。

Make sure 实战 - SpeakingMax英语口语达人

It's essentially another way to regain access to your Facebook page if you forget your password.

CNN: Mark Milian,

And, while you're at it, don't forget your flask, survival suit, ice axe and crampons.

BBC: Chick Young's view

Don't forget your existing customers -- the cheapest source of repeat and new business.

FORBES: Startup Clinic / Growing Pains: Yo, customer!