Esta and estas are different, but have essentially the same meaning. Estas and esta are the present tense forms of "estar", which means "to be". Estas means "you are", and "esta" means "he, she or it is". The verb estar is used for more immediate feelings/actions.
No estas casada translates to mean you are not married in English.
you are killing
you are demented
"You are in my life" "You are part of my life"
In a question: Are you busy (occupied) In a statement: You are busy
No estas casada translates to mean you are not married in English.
"Con quien estas" translates to "who are you with" in English.
"y como estas" in English is: "And how are you?"
you are killing
"Are you possessed?"
you are far
"are these cool"
"Estas en la escuela" in English means "You are at school."
you are demented
"Right wher you are"
In English that would mean: "How are you Miss?"
"Right wher you are"