in school
prep. phr..prep. phr.. This phrase means you are currently a student, attending classes at a school, college, or university.
prep. phr.. Indicates the state of being enrolled as a student at an educational institution, rather than simply being physically present in the building.
My younger sister is still in school.
He can't work full-time because he's still in school studying to be an engineer.
Although already a celebrated musician, she chose to remain in school to complete her degree in music theory, valuing formal education above early fame.
Used without an article ('a' or 'the') to describe the general state or activity of being a student.
Contrast 'in school' (the state of being a student) with 'at school' (the general location) and 'in the school' (inside a specific building).
She is in a school.She is in school.When describing the general state of being a student, no article ('a' or 'the') is used before 'school'.