In the CALD, it says:
as
conjunction
in the same way
As is often the case with children, Amy was completely better by the time the doctor arrived.
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Is this sentence a inversion? In other words, it is the same as:
As the case with children often is, Amy was completely better by the time the doctor arrived.
As is often the case with children , Amy was completely better by the time the doctor arrived. Yes, I think it is an inversion of as the case with children often is (or as the case often is with children ), though it is idiomatic and perfectly normal. Incidentally, if you're interested, is often the case with children is a comparative clause functioning as complement of the preposition as , with the whole underlined PP functioning as an adjunct of comparison.
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As is often the case with children, Amy was completely better by the time the doctor arrived.
Yes, I think it is an inversion of as the case with children often is (or as the case often is with children), though it is idiomatic and perfectly normal.
Incidentally, if you're interested, is often the case with c