Extraction (linguistic)
A extraction is a process of emphase, like dislocation. It is about the framing of a component by it is… which or it is… which at the head or at the end of the sentence:
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at the beginning of sentence:
It is Louis Jouvet which created the parts of Giraudoux (and not Bertold Brecht) ( which is here the pronoun which replaces the prone ) - They are the parts of Giraudoux which Louis Jouvet created (and not those of Molière) ( that is here the pronoun which replaces the complement or the attribute).
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at the end of the sentence:
the parts of Giraudoux, it is Louis Jouvet which created them . - Louis Jouvet, they are the parts of Giraudoux which it created.
References
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Riegel-Pellat-Rioul, methodical Grammar of French , PUF, 1999, ISBN 2 13 050249 0