The phrase "a big classroom" is correct and usable in written English.
You can use it to describe the size of a classroom, typically in a context where size is relevant, such as discussing school facilities or teaching environments.
Example: "The new school building features a big classroom that can accommodate up to 40 students comfortably."
Alternatives: "a large classroom" or "a spacious classroom".
It's just being in a big classroom, and every once in a while a light bulb goes off.
When I'm in that moment, interacting with constituents, and when I feel like I'm learning or teaching, it's like being in a big classroom.
In a way education by its nature favours the extrovert because you are taking kids and putting them into a big classroom, which is automatically going to be a high-stimulation environment.
Upstairs, there's a big classroom in which 22 students sit in various stages of dejection, looking at coloured maps of central London on the table in front of them.
This is a student arriving first semester at Cornell, walking into a big classroom, getting hit by the fact that this is hard, this is not what I'm used to, and they lose confidence in their ability to perform.
Along with Brian Anselmo, 27, his friend and business partner who lives on the farm, Mr. Reese plans a big classroom and buildings to house students who will come to the ranch to learn what it takes to hand-pick breeding turkeys and raise them properly.
Over dinner (salad, a crab cake and white wine) on a recent evening at Porter House New York in Manhattan, Ms. Behar said, "Someone once told me I'm still teaching, only now I have a bigger classroom".
Scalability: In the conventional set-up, if you want to increase the number of students in a class, you need to move to a bigger classroom.
A discussion-group feature allows the sort of give-and-take among students and with their professors that a big-classroom atmosphere can deter.
As student, Julianna Jochumson so eloquently put it, "The thing I like most about the garden is being able to have hands-on projects instead of sitting in a big, boring classroom all day".
Remember, it's not a big thing, classroom flirting, and should be small, not big and obvious.
