What is your phone number?
Cual es tu telefono = What is your telephone number
"What's your telephone number?" How DO you answer that?
Cual es la fecha de hoy translates from Spanish to English to mean "What is today's date?"
Cual es la fecha de hoy translates from Spanish to English to mean "What is today's date?"
cual es tu means 'what is your....' (informal)cual es su means 'what is your....' (formal)
What is your language Mine is Castilian Spanish; and yours, what is it
What is your email.
que es el mejor or cual es
Mi nombre es...
cual es tu preferida, literally, means (as close as possible: which girl do you prefer? Cual prefieres (sp) is closer to: which do you prefer.
What's your least favorite class
Which is your favorite month of the year?