Here is some useful vocabulary in different registers for giving information:
Informal
- I’m not sure if you know but…
- Hey, did you know…?
- Have you heard about…?
Informal or semi-formal
- Just to let you know..
- I thought you should know that…
Semi-formal or formal
- To confirm..
- You may be interested to know..
- Are you aware…?
- For your information…
Formal
- It may be worthwhile to be aware that..
- You should be informed that…
Suitable for all types of register
- It may be useful for you to know..
- I think I should tell you…