Kra seg yinagmayen nnan-d belli tasuqilt d taɣult seg tesnilest, amedya adlis n "John Catford" i d yessufeɣ deg useggas n 1965 s uzwel "A linguistic theory of translation" yenna-d tasuqilt d tamsalt n umeslay tasnilest txeddem ɣef umeslay, ɣef anect-agi tasuqilt d taɣawsa n tesnilest.