J’sais is an informal pronunciation of je sais.
How is j’sais pronounced? Like ché.
But this doesn’t mean that you won’t hear the full je sais during informal conversations, because you most definitely will.
You can stick with je sais yourself, which is always acceptable, but learn to recognise j’sais (ché) for the times when you may hear it.
Mmm… je sais pas trop, là. (informal)
Mmm… j’sais pas trop, là. (even more informal)
Hmm… I’m not too sure.
[This entry was inspired by the character Thomas in Les Parent, “Blues d’automne,” season 3, episode 7, Radio-Canada, Montreal, 25 October 2010.]