Learning a new language can sometimes be a bit tricky because the rules of grammar vary greatly in foreign languages. As such the concepts of time of action and the comparative nature of certain events, be must be taken into consideration while using certain words. Vocabulary can be built later, but the grammar has to be understood first.
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Aun is used to indicate the introduction of a word or point into an argument, as a comparative parameter. Todavia on the other hand differs in its usage depending on the state of an action or activity.
References
- https://dialnet.unirioja.es/servlet/articulo?codigo=6749168
- https://dialnet.unirioja.es/descarga/articulo/1958984.pdf