"Por favor, não!"
Please, not! is not used in English, I haven't tried it but maybe "Please, don't!" would be accepted too...
little confused about this, does it mean:" please, don't do that " something like that?
really? "no thanks" is incorrect. "Please not" isn't used in english at all. This site has issues.
yes, it (no thanks) IS in fact incorrect....you can think of it in the terms of how it is used to figure out why it is wrong....
e.g.: if someone was offering you a cookie and you didn't want it you would say: obrigado/a, não (no thanks)
if someone was hurting you, you would say: Por favor, não! (please, don't)
P.S- you are correct, "Please, not!" is not used in English at all.