Hello, There is not really such thing as genitive in French ; words might only change for plural and / or feminine. Maybe you could write a full example so that we can see what you mean. You can consider different meanings related to "genitive": - composition: "une réunion d'elfes" (I could not find an example with a singular but this is probably caused by a lack of inspiration). It looks like the previous answer is considering this case. - possession: "l'arc de l'elfe". - ... there are others but it gets difficult to find examples with "elfe". You have to be careful as you can see the construction is a bit different depending on the meaning. I would say that depending on the word you can not have all the meanings. I always find "de" difficult to explain.

Here are the rules: "de la " remains "de la" "de le " becomes DU "de les" becomes DES "de le " + a word with a vocal becomes " D' " Examples: un bureau d'acajou un bébé d'un an In case of a word starting with a vocal after "de la" you will also contract it to 'de l' " as in : Elle est payée 20 euros de l'heure.