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a) No significa ningun o/a/os/as, si se lo usa como adjetivo.
b) No delante de un comparativo (vea capítulo 13) significa no...más.
c) None se utiliza sólo como sustantivo y equivale a ningun o/a/os/as utilizado como sustantivo.
Ejemplos
a) No child should grow up in poverty.
a) There is no tree in our street.
b) He said, he would wait no longer.
b) There is no better way to be happy.
c) I was looking for a nice shirt; I found none.
c) Is there any coffee left? Sorry, there is none left.