Question

1. I can't concentrate on work.
2. I can't concentrate at work.
3. I can't concentrate (on something) at work.
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Which one is correct? Does #1 mean #3?

Answer 1

1 and 2 are fine, but mean different things.

3 will be fine once the parentheses are removed.

1 and 3 are very close, but not identical in meaning.