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25 Sep 2016, 11:46
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22gmat
Here "it" is a placeholder, i.e. it holds the place of a subject or an object phrase that is required to be shifted to the end of the sentence to avoid awkwardness:
To see you is good.
It is good to see you.: Placeholder "it" holds the position of "to see you".
That we found a way out was critical for us.
It was critical for us that we found a way out.: Placeholder "it" holds the position of "that we found a way out".
Do not search for an antecedent for a placeholder "it".
Similarly, in this example:
They consider it important that all of their employees have a clean criminal record.
"It" is placeholder for "that all of their employees have a clean criminal record".
Without the placeholder"it" the sentence would be awkward:
That all of their employees have a clean criminal record they consider important.
27 Sep 2016, 00:07
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khv, prerequisites are necessary by definition, so yes, that's redundant. The phrase "necessary prerequisite" certainly gets thrown around a bit in everyday usage, perhaps to emphasize a prerequisite that you really should/must meet rather than one that is simply traditional, but I don't think we'd be likely to see this usage in a correct SC answer.
