“it” for a transitive verb, like a dummy pronoun?

Is the following sentence correct?

We refine it when we can revisit a vertex.

The “it” refers to nothing (it seems to be the dummy pronoun), but the sentence seems correct to me. I think “it” is needed, because “refine” is a transitive verb. What I want to say in this sentence is that we refine the circumstances when we can revisit a vertex.

Is there some grammar rule that would back my claim that the sentence is correct?



“it” refers to nothing

No! This is not true. The “it” probably refers to a term mentioned in the previous sentence. If this was indeed a standalone sentence, then “it” shouldn’t be used.

Source : Link , Question Author : Irek Szcześniak , Answer Author : QuIcKmAtHs

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