Yes! Assimil offers a free 12-page sample of selected workbooks on their website. Search for "Assimil extrait gratuit" or check the product page of the French workbook—there is often a green button "Feuilleter" (Browse) that shows a preview PDF.
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The workbook's primary value lies in its ability to bridge the two phases of the Assimil method: The Passive Phase: assimil french workbook pdf