tu eres feliz (you are happy)
usted es feliz (you are happy)
tu estas en la playa (you are in the beach)
usted está en la playa (you are in the beach)
tu eres / usted es (ser)
tu estas / usted está (estar)
When you are talking with near persons like friends, familiar, or a very well-known person, you can use "tu" to refer to a person, but if you don't know a person or don't have enough confidence, then you should use the word "usted" that is more polite or formal.
In the other hand, verb to be has two different meanings in spanish:
1) "ser": You are beautiful (tu eres bonita)
2) "estar": You are in New York (usted está en Nueva York)
I hope this be useful
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