“There must be a reason.”
“It must be for a reason.”
"it" refers, we suppose, to "what happened". This is mentioned in the second sentence but not the first. To make them have the same meaning: There must be a reason for it.
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"it" refers, we suppose, to "what happened".
This is mentioned in the second sentence but not the first.
To make them have the same meaning:
There must be a reason for it.
It must be for a reason.
CJ