Please follow up on the problem. I will follow up on it. I will follow up on this issue/problem.
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Mister MicawberPlease follow up on the problem.I will follow up on it.I will follow up on this issue/problem.I will follow up on this issue/problem.Thank you very much, teacher. So 'on' is required in all of them, as you have shown, right?
Mister MicawberIt seems to me that 'on' is required for accurate meaning when 'up' is internal.I got it. But is the one with the external 'up' correct?