1. Just a heads up is used to give someone an early warning about something.
Just a heads up: I might ask you to help me with my project next week.
2. FYI stands for for your information. It’s used to share information that doesn’t require any action.
FYI: I’m coming home late today.
3. Just between you and me is used to say that the information you’re about to share should be kept secret.
Just between you and me, I think Gina is going to quit this week!
Hey, Taisuke! It’s me, Joy. Hope you’re enjoying your vacation! FYI: Suzuki-san just made a huge announcement earlier today. He’ll be moving to our Tokyo branch next month! Just a heads up: He’ll be transferring his tasks to us starting next week. He’s already set a lot of meetings, so be ready, okay? (pause) Oh, right. Rika and I went drinking last night. She got so drunk that she got sick. OMG [oh-em-jee], it was really embarrassing! Just between you and me, I’ll never drink with her again. I can’t wait to tell you more about what happened when you get back.
Rの住人
Between you and me
FYI返し
博士