It's not that he can't use them, it's more like he doesn't need them, besides summoning jutsu, and the kagebunshin and sexy jutsu, the rest of Naruto's jutsu don't require handselas.
Yeah really naruto doesnt really make alot of hand seals..
but then agen neither does sasuke anymore
he uses his mangekyou sharingan mostly..
would be cool though if naruto learn more