<b>Chi</b>;Who;Chi sei? (Who are you?)
<b>Che cosa</b>;What;Che cosa mangi? (What are you eating?)
<b>Che</b>;What;Che lavoro fai? (What is your job?)
<b>Quando</b>;When;Quando cominci? (When do you start?)
<b>Dove</b>;Where;Dove vai? (Where are you going?)
<b>Come</b>;How;Come stai? (How are you?)
<b>Perché</b>;Why;Perché non mi ami? (Why don't you love me?)
<b>Quanto</b>*;How much;Quanto costa? (How much does it cost?)
<b>Quale</b>*;Which;Quale preferisci? (Which one do you prefer?)
*Quanto, when used as an adjective (just before a noun), agrees in gender and number with the following noun.
Examples:
Quanto costa?;How much does it cost?
Quanti negozi ci sono?;How many shops are there?
Quanta pasta vuoi?;How much pasta do you want?
Quante amiche hai?;How many female friends do you have?
*Quale agrees in number with the noun that it refers to:
Quale canzone preferisci?;Which song do you prefer?
Quali sono i tuoi colori preferiti?;Which are your favourite colours?
Perché means both why and because. Intonation and context play important roles.