Yes, but leave out into is better.
I entered the classroom.
You have entered the room.
"He entered the room" is the way the sentence should read
Both of those sentences are correct but he first one would be more appropriate to say.
Purgatory can be a noun or an adjective. She felt like their relationship had entered purgatory. The classroom discussion turned to the idea of purgatory.
No. We say at your school, but in your classroom
She entered the room
Derision is a word used to describe mockery. A good example sentence would be, the boy was greeted with derision when he entered the classroom.
Please move to the next classroom. This classroom is damp and chilly.
My company has entered into.....
The word for a place of education is one word, classroom.
This classroom has more chairs than that one.
THere was a dimension in my classroom