why don't we/you
Perché non ci provate un'altra volta?
Why don't you try again?
Perché non ci avete detto di questo prima?
Why didn’t you tell us about this earlier?
Why aren't you helping us?
Perché non ci hai detto che questo stava per capitare?
Why didn’t you tell us this was about to happen?
Why doesn't he think about it?