"You know who I am talking about" in Spanish is "Sabes de quien hablo". It is pronounced "SA-base day key-IN AH-blow". Please see this site for confirmation of the translation:
http://www.answers.com/library/Translations
demográficas (if you are talking about variables) or demográficos (if you are talking about values), remember that spanish usually makes a gender differenciation depending on the vowels used ;)
When you are talking about suits of cards, the word "diamante" is used.
When you are talking about yourself, you say "Tengo (your age) años."
Depends on what you are talking about, but you can mostly get away with "yo tambien" (me,too)
Sabe usted.....
You say, escuela primaria, or just primaria. They'll know you're talking about a school.
I am talking- Estoy ablando. I am talking in Spanish- Estoy ablando en Espanol.
Hablando
tu when you're talking to someone you (talking to a friend: Quien es tu novia?)su when you're talking to someone you don't know/an adult(talking to...someone you dont know: me gusta su camisa.)
I know what I am talking about.
Depending on who you are talking to, "¿Conoces este chico?" or "¿Conoce usted este chico?"
"¿Sabe usted que yo estoy hablando de ti?"
Adios if your talking to a close friend or family member and chau (ch - ow) if your talking to someone you just met or don't know.
If you are talking about a dagger-like knife, then you can say "punal". If you are talking about a knife you would use in the kitchen, then you could say "Cuchillo".
you just say i dont know what you're talking about
If you are talking to someone you know informally (you use tú with them), you would say "sé más profesional". If it is someone you know formally (you used usted with them), you would say "sea más profesional"
Do you= "Haces tu?" (If you are talking to a peer) Do you= "Haces usted?" (If you are talking to an adult)