If you go on the website, rather than the mobile app, you can read the notes on each section. They give very detailed explanations. In essence, -ul is masculine and -ea is feminine, but there's a lot more to it than that.
Is there any way to tell if the definite form is going to be '-ea' or '-ul'?
Beautiful language. Wish it was more common. My knowlege of French is definitely helping to learn it
I agree. Heck, I love French, Romanian, and Portuguese so much that I wish they were popular. As a Latino, I admit my native language Spanish is vastly overrated on a global scale. But that's my humble opinion Please, I hope no one takes offense. I guess growing up with 2 languages for me got stagnant.
If you mean nouns then neutral plural = feminine, neutral singular = masculine. If you mean verbs then the conjugation/suffix depends on whether it's 1st/2nd/3rd person and if it's singular or plural.