Do you have the impression that he's a native British speaker? konrad If someone tell somebody "If you have finished your work, you can have a break," the employee has to finish his work first and then he can have a break. This has nothing to do with the future.
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konrad If someone tell somebody "If you have finished your work, you can have a break," the employee has to finish his work first and then he can have a break. This has nothing to do with the future. It involves no promise that if the employee finishes his work in the future, he may then take his break.
konrad... the difference between ...If you are already at the point (now) where your work is finished, you can have a break.
"If you have finished your work, you can have a break" and "If you finish your work, you can have a break."