When a school is being referred to as an institution, you do not need
to use the: When do the children finish school? When you are
talking about a particular building, the is used: I’ll meet you
outside the school. Prison, jail, court, and church work in the same
way: Her husband spent three years in prison. Source
These are not wrong: "We go to school" & "We go to the same school".
My question is that whether we can say: "We go to same school?". I can feel that is wrong but not sure.
Best Answer
To go to school means to be a student. The singular school without determiner has that meaning.
As soon as you add the adjective same in front of "school", you're referring to a particular place (not to being a student) and so an article is needed.
We cannot say:
I like same movie.
I visit same restaurant.
I like same girl.
I go to same school.
You must say "the same" + noun.