Hello. I came across with the following sentence, and would like to ask a question regarding it: It's a brave new world for people whose job it is to sell you things.
Why is there "it" before "is" (ie. why didn't the author write "...whose job is to sell you things.")?
Most of the times, I don't see "it" preceding "is" in a situation like this, but every once in a while, I do see "it" preceding "is", as in the sentence of interest.
Is there any difference between "job is to ....." and "job it is to......", or are they essentially the same thing?
Could someone please explain? I'm very curious about this. Thank you so much, as always, in advance.