In Kiranti languages, rich alternations in verbal paradigms make internal reconstruction possible, and allow a better understanding of the vowels and codas of the proto-language than is possible for other parts of speech. This paper, using data from four representative languages (Wambule, Khaling, Bantawa, Limbu), proposes a new approach to Proto- Kiranti historical linguistics combining the comparative method and internal reconstruction, and taking morphological alternations and analogy into account. It presents a comprehensive account of the sound correspondences between the four target languages and reconstructs more than 280 proto-Kiranti verb roots.