❌ I want to inform you about the completion of the project that I have been working on.
✅ I've finished the project / The project is done.
프로젝트 완료를 알릴 때 한국인은 보고 형식으로 길게 말하지만, 직장에서는 간단 명료한 표현이 효율적입니다.
잘못된 예: Hi Sam, I want to inform you about the completion of the project, so please check the attached files.
올바른 예: Hi Sam, I've just finished the project, so please take a look at the attached files when you're free.