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>Does 'sen-siz' mean the familiar and formal as in 'istersen' vs 'istersiniz' ?

Yes... If you want to a formal conversation or you want to show your respect you have to use plural... :))


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quiet and inexpensive place" but what is the part about Turtle nests? (Turtle shells? kabugu ? )

"Caretta Caretta" Turtles ovulate in Antalya (Cirali, Patara ...) . I mean that. Not about the shells... :))