A Comparative Grammar of the Modern Aryan Languages of India v3.c17.s2.73

v3.c17.s2.73

G. has नथी for all persons of both tenses, they say हूं नथी “I am not,” तुं नथी “thou art not,” ते नथी “he is not.” This is a case of forgetfulness of the origin of a word leading to its use being extended to cases where it has no right to be, for नथी is clearly derived from अस्ति, the Pr. form of अस्ति with न prefixed, and thus, strictly speaking, belongs only to the 3 sing.