It's a bit inconsiderate of her not to let you know when she expects to arrive.

她不让你知道她什么时候会到，这样做有些不体谅人。

《柯林斯英汉双解大词典》

I have a dream, about you, but I dare not to let you know, so I put it with password, until one day, you decipher it.

我有一个梦，关于你，可我不敢让你知道，因此我把它加上密码，直到一天，你把它破译。

youdao

Even if he bores you stiff, it is good manners not to let him know it.

即使他把你烦透了，出于礼貌你也不能让他看出来。

《柯林斯英汉双解大词典》

In a poker game you do not want to let your opponents know if your cards are good or bad.

VOA: special.2009.11.22

So, many of you are new to the Boston area, now I still realize, and I want to let you know it's not required that you be a Red Sox fan to be at MIT.

你们中很多人新来到波士顿地区，现在我仍认识到，我想让你们知道在麻省理工学院,不一定必须做一个红袜队的球迷。

麻省理工公开课 - 化学原理课程节选

Although it's not true that you are speaking French-- let's suppose that you know how to speak French-- it's still true of you while you're asleep that you can or could speak French.

虽然你并不在说法语-,先假设你会说法语-,但是确实在你睡觉时,你是有可能开口说法语的。

耶鲁公开课 - 死亡课程节选

So if, as so often happens, a creditor agrees to wipe your slate clean if you come up with most but not all of the money owed, you have to let the government know how much your debt was reduced by, and pay tax on it.

FORBES: Why Paying Off Credit Card Debt Creates Tax-Time Headaches

If you are very clear that you do not want to be resuscitated when you stop breathing, let the people where you live know what you want and put it in writing.

FORBES: Nurse Refuses To Give CPR, Senior Dies: Ethical Problem Or Legal Issue?

But you have to set the boundaries and let people know what you absolutely will not accept.

FORBES: Are You Working With An Office Terror?