Is it wrong to say
He is sitting at the backside of the classroom
The desk is at the front side of the class .
When can we use at the backside and at the front side?! What about these two sentences? Are they wrong?!
He is sitting on the left side of me
If yes, how can I use on the left side and on the right side in a sentence? I'd really appreciate it if you help me with these sentences because it's been a long time I've been thinking about them but I couldn't find any suitable answers.