Hola Lisa,

for all questions linked to this lesson, we added a hint, telling the students what the actual word for the nationality is (ending in -e). So, if you need the adjective in the feminine form, you have the base (the masculine form) to form the feminine, which in these cases you don't need to change as it is invariable. 

Nevertheless, we will create a studylist with nationalities that end in -e so you have them in one place to memorise. I hope this helps.

Saludos

Inma