我的妹妹和我都是学生用英语表达有以下方式：谓语动词用复数1. My sister and I are students.（最普通表达法）；2.Both my sister and I are students.

3. Not only my sister but also I am a student.（谓语动词就近原则）。

4. My sister as well as I is a student。（谓语动词适用就远原则）。