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Hi

He teaches English to beginners and pre-intermediates.

--- Is it OK to say "pre-intermediates" or maybe "and to students at the pre-intermediate level"? I just wanted to keep it short. Emotion: smile
Comments 
The shorter version is OK. If you add "advanced" it becomes more awkward. In that case:

He teaches English at the beginning, pre-intermediate, and advanced levels.

All the best,
A-Emotion: stars
Thanks for the answer.

I was almost sure that "pre-intermediates" is incorrect Emotion: wink