doesn't know, he doesn't know how to
He doesn't even know your name.
Il ne sait pas que j'ai un chat.
He doesn't know that I have a cat.
Je sais qu'il ne sait pas où tu es.
I know that he doesn't know where you are.
L'homme est malheureux parce qu'il ne sait pas qu'il est heureux.
Man is unhappy because he doesn’t know that he is happy.
Il ne sait pas ce que c'est que d'être pauvre.
He doesn't know what it's like to be poor.
He doesn't know where he is.
Il ne sait pas même votre nom.
He doesn't even know your name.
Il ne sait pas que j'en ai un.
He doesn't know that I have one.
— Star Wars, épisode I - La Menace fantôme (1999)
He doesn't know how to count.
Cet esprit, il pêche, il ne sait pas non plus ce qu'il va attraper.
That spirit is fishing; it doesn’t know what it’s going to catch either.
— The Strangers (2016)
Il ne sait pas du tout nager, mais quand il faut skier, c'est le meilleur.
He can't swim at all, but when it comes to skiing, he's the best.
He doesn't know how to joke.
Il ne sait pas dire non aux femmes.
He doesn't know how to say no to women.
— Femmes au bord de la crise de nerfs (1988)
He doesn't know how to go about it.
Celui qui ne sait pas se taire, il ne sait pas non plus parler.
He who does not know how to be silent, does not know how to speak either.
Il ne sait pas conduire une voiture.
He doesn't know how to drive a car.