Hello...
I guess that A is standard, while B sounds awkward.
Is B only awkward or is it considered simply impossible to native's senses?
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The machine is broken.
A. It needs to be repaired.
B. Repairing is required of it.
B is not a usable sentence. It is unnatural and, as far as its meaning can be understood, it seems to mean the wrong thing anyway. When something is "required of X", it normally means that X needs to do something, not that something needs to be done to X.
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B is not a usable sentence. It is unnatural and, as far as its meaning can be understood, it seems to mean the wrong thing anyway. When something is "required of X", it normally means that X needs to do something, not that something needs to be done to X.
Only A is correct.
B sounds ridiculous. It seems to be saying that the machine should repair itself.
You could say 'Repairing it is required of Tom', but this sounds silly too. You'd naturally say
eg Tom needs to repair it.
Clive