For quantities:
* Mais: This is the most common and general translation. It works for most situations where you want to express "more" in the sense of "a greater quantity."
* Outro(a) (masculine/feminine): This means "another" and can be used to express "more" in the sense of "one more." For example, "Quero outro pedaço de bolo" (I want another piece of cake).
For intensity:
* Mais: This also applies to intensity. For example, "A música está mais alta agora" (The music is louder now).
* Mais ainda: This means "even more" and emphasizes a higher level of intensity. For example, "Estou mais ainda feliz por você" (I am even happier for you).
For time:
* Mais: Again, this can be used. For example, "Vou ficar mais um pouco" (I will stay a little longer).
* Mais tarde: This means "later" and specifically indicates more time in the future.
For comparison:
* Mais: This is used for comparing things. For example, "Ele é mais alto que ela" (He is taller than her).
* Mais (do) que: This means "more than" and is used for specific comparisons. For example, "Eu tenho mais livros do que você" (I have more books than you).
So, to correctly translate "more" into Portuguese, you need to consider the context and choose the appropriate word.