@chr0m Hi, you can use "trabajar" and "mejorar" respectively. But be carefull cause "to work on" and "trabajar" are not exactly the same. For that you've got to use the the preposition "en" after trabajar. So then use it in the correct context like: "tengo que trabajar en mi vida" or "tengo que trabajar en mi horrible pronunciación" so then we get the word is about improvement and we don't misunderstand the term with the common meaning of it. So if you use it like this:"estoy trabajando en un projecto" we can understand 2 diferent things:1 you're working on something you want or gotta do 2 you're working on something you're improving. Hope I didn't confuse you. Good luck.
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