The formation of the future tense is often mentioned in discussions on the classification of the modern Indo-Aryan languages. An -s- type of future occurs in Gujarati, Lahnda, and Jaipuri, an -h- type of future exists side by side with participial formations in Marwari, Hindi (Braj), and Bundeli, and in Bhojpuri and Awadhi (in the third persons only), as well as in Kashmiri, where it has assumed the meaning of a past conditional. Despite this Marwari belongs to the -s- group, forms with -h- being found in those dialects of Marwari that regularly have voiceless -h- < -s-. The explanation of the Kashmiri forms is similar (ś > h and -ṣy- > -śś- > -h- in Kashmiri). Thus -s- forms in principle are found over a large part of the North-West and West of India. Attempts have been made to trace back the modern conditions to earlier stages, and S. Sen claims that the two types of future go back to different Indo-European originals: “From early times there were dialectal forms with the base-affix -ha-, which became quite dominant in Apabhraṃśa.” (This is incorrect.) “The origin seems to have been the I.E. stem affix *-so-, OIA. -sa-, occurring in the desiderative, the aorist, and as a root-determinative.” The accepted opinion is that the two types of future have the same origin, the OIA. future suffix -i-ṣya-, and that differentiation did not take place till the Middle Indo-Aryan period. As has been shown conclusively by Turner and by Bloch, the future suffix of Sanskrit could have in MIA. a special development into -h- instead of -ss- which is phonetically regular, because it was in a weak position, being a terminational element.