- Which word fits this sentence better?
I prefer individual lessons(,) where your teacher and you can be more concentrated/focused and work on specific topics.
Cambridge Dictionary suggests that 'concentrated' might mean 'using a lot of effort to succeed at one particular thing':
However, it somehow sounds as if I'm talking about juice. :) Can people be 'concentrated'?
- Is the comma necessary in the sentence? I think it's a non-restrictive relative clause cause the information it introduces is not essential. Am I right?