Is it possible to prove the Altaic theory on the basis of negative forms in Mongolian, Manchu and Turkish?

The research question posed in this article is whether the Altaic theory is possible, if it is discussed on the basis of chosen negative forms in Mongolian, Turkish, Manchu and its Sibe dialect. The supporters of the Altaic theory assume that these languages (and some include Japanese, Korean and Ainu to this list (Miller, 1967)) emerged from the same root. The opponents of this theory think that the similarities in these languages have resulted from historical contacts between their speakers (Doerfer, 1966, p.122). This article consists of the analysis of negative forms in various stages of Mongolian, Manchu and Turkish languages carried out on the basis of literary monuments and contemporary resources. The conclusions concerning the possibility of the Altaic theory based on the described negative forms have been presented at the end, accompanied by the Index of negative particles and suffixes.