"¿Cuándo es nuestro examen?" means "When is our exam?"
Un examen (masc.) is "an exam" in English.
"Cuando llama" in English means "When she calls."
"Cuando tengo" translates to "when I have" in English.
"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 you want [to]."
It means "When I call you"
¿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.