1- I like working in classroom
2- I like working in classrooms.
3- I like working in a classroom
What are the differences here ?
My guess is that 1 and 2 are synonyms and the speakers are talking about any classroom in general. if so what is the subtle difference ?
In the third one the speaker talks about one classroom from a specific group (as his school or something like that). Still unsure, could anybody help in that ?