
Extraposition is a mechanism of syntax that alters word order in such a manner that a relatively `heavy` constituent appears to the right of its canonical position. Extraposing a constituent results in a discontinuity and in this regard, it is unlike shifting, which does not generate a discontinuity. The extraposed constituent is separated from .....
Found on
http://en.wikipedia.org/wiki/Extraposition

a rule of transformational grammar that shifts a subordinate or modifying clause to the end of a sentence, as in changing That you sign the paper is necessary to It is necessary that you sign the paper.
Found on
https://www.infoplease.com/dictionary/extraposition
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