hlad: trápit koho hladystarve sb
copak: Copak tě trápí?What's worrying you?, What is it that worries you?
trápit: Co tě trápí?What is worrying/troubling/bothering you?
trápit se: Netrap se tím.Don't worry about it.
trápit se: Trápí se.She is grieving.