Rarely will a person be able to explain such a thing!

Apparently, generally speaking, we invert subject and verb (or DO as auxiliary) when a (near-) negative begins the sentence:

Never/Rarely/Seldom have I seen such a sight.
Rarely/seldom do you see such beauty.

So that is why I have written ‘Rarely will a person…’ (Although in truth, to a native speaker, they won’t know this ‘rule’, it will just sound ‘right’)

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