"¿Cuándo es nuestro examen?" means "When is our exam?"
Un examen (masc.) is "an exam" in English.
"Cuando tengo" translates to "when I have" in English.
"Cuando llama" in English means "When she calls."
"Cuando vuelvas" means "when you come back" in English.
"Cuando llegamos tarde" translates to "When we arrive late" in English.
The day of the examination.
when (he or she) decides to
It means "When I call you"
It means, "When you want [to]."
¿Cuando vas tú a la fiesta?When are you going to the party?
"cuando comes el almuerzo" means "when you eat lunch"
'Cuando llora el chico' means: when the boy cries.