It means "You are the apple of my eye".
"You are lost."
you are demented
tu estas muy buena means that your hot in other words DAM MAM YOU LOOK GOOD
This is an incomplete statement that means When you are
'tu estas' (with an accent on the 'a') = 'you are'
It should say tu "estas" enfermo, which means you are sick.
Because your not talking to me
That means "You are in....."Tú estás en = You are in/on
"If you are." (If it's "si") "Yes, you are." (If it's "sí")
Properly "¿Cómo está tu madre?" and means "How is your mother?"
"Donde estas tu" is Spanish for "where are you?" It is a question asking about someone's current location.
If you're not here is the English equivalent of 'Si tu no estas aqui'. In the word by word translation, the conjunction 'si' means 'if'. The personal pronuon 'tu' means 'you'. The adverb 'no' means 'not'. The verb 'estas' means '[you] are'. The adverb 'aqui' means 'here'.