6. Compounds made of invariables, of course, do not change, as:
passe-partout, _master key_, _master keys_.
pour-boire, _a tip_, _tips_.
§ 7. NOUNS HAVING NO PLURAL.
French Reader on the Cumulative Method The story of Rodolphe and Coco the Chimpanzee · 第 139 / 418 题