お知らせくださいって英語でなんて言うの？

In American English, the first phrase is very formal, and the second phrase is less formal but made more so by adding the word 'please'. The second phrase could be used among colleagues who know each other, but is probably not appropriate for speaking to a superior, such as a Manager or Professor. The phrase 'give me a head's up' comes from the idea that when someone realizes something often they raise their head with attention. I hope that this is useful to you in your studies.

When you want someone to let you know about certain information as soon as they get it, you can use the following expressions: "Please notify me!" "Please inform me as soon as possible!" "Please advise me of any changes!" "notify" or "inform" or "advise" mean to let me know

"Keep me posted" is a more casual way of expressing this, same conclusion in the fact that you are asking to be notified. "Notify" is a very formal and polite way of asking. "can you notify me" "If anything changes I'd like to be notified"

When you ask a question, it is more polite than making a request. Also, it is always good to use please. I hope that this helps. :)

When you want to ask someone to inform you about something when they know in a polite way; then you may explain this in the following ways: -Please do let me know. -I would really appreciate it if you could let me know.