The finite passive is formed two ways in Arabic: internally (the apophonic passive) and externally (formed by a prefix). The apophonic passive displays the vowel sequence u – i instead of a – a or a – i of its active counterpart in the perfect. In the imperfect, the apophonic passive uniformly displays the vowel a instead of i/u (as the second vowel), and all the forms are inflected with the u-series of the prefixes:
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Encyclopedia of Arabic Language and Linguistics, Managing Editors Online Edition: Lutz Edzard, Rudolf de Jong.
Consulted online on 20 October 2017 <http://dx.doi.org/10.1163/1570-6699_eall_EALL_COM_vol3_0249>
First published online: 2011
First print edition: ISBN: 9789004177024, 20090831