'is' is better than 'was'

8_and_then.md

@@ -60,7 +60,7 @@ Did you succeed or not ?
 
 Was it fine ?
 
-Please complete [this form](https://sondagesv3.unistra.fr/index.php/751712?lang=en) to let me know if my repository was usefull or not.
+Please complete [this form](https://sondagesv3.unistra.fr/index.php/751712?lang=en) to let me know if my repository is usefull or not.
 
 If yes, it will encourage me to make it still better :smiley: