It is often used in the negative sense, for example:
* Je ne mangerai jamais ça. (I will never eat that.)
* Il n'est jamais arrivé. (He never arrived.)
* Elle n'a jamais vu la mer. (She has never seen the sea.)
"Jamais" can also be used in a more positive or emphatic way, like:
* Je t'aimerai jamais. (I will love you forever.)
* Je n'oublierai jamais ce jour. (I will never forget that day.)
It's important to note that "jamais" is typically used with a negative verb, and it often stands in for "not ever" or "not at any time."