As a conjunction:
* that: "Je sais que tu es là" - "I know that you are there"
* what: "Que veux-tu?" - "What do you want?"
* whether: "Je ne sais pas que venir" - "I don't know whether to come"
As a pronoun:
* what: "Que fais-tu?" - "What are you doing?"
* which: "Que veux-tu boire?" - "Which do you want to drink?"
As an adjective:
* what, which: "Que livres veux-tu lire?" - "Which books do you want to read?"
Other uses:
* that (emphasis): "Que c'est beau!" - "How beautiful it is!"
* as: "Que tu sois gentil" - "As you are kind"
It's important to analyze the sentence to determine the correct translation of "que" based on its grammatical function.