[Lingtyp] Negation marks adverbial clauses

[mohammad rasekh]

Dear All,I hope you have started a happy new year.In the corpus of one of my students in Hamedani Persian (a variety spoken in Hamedan, west of Iran), we have found some adverbial clauses in which the verb is marked by negative prefix, but it does not mean negative. These adverbial clauses mark Time (meaning 'as soon as') and Reason, or both at the same time. Some examples:
 
1.       i               ke           kur          na-šod,  man        diye          ruz-e xoš                  na-didam

        he            that        blind       NEG-become, I    anymoreday-EZ happy     NEG-see-1SG 
        As soon as he got blind, I had no good times.
2.      das       ke         ne-mi-keš-i                               ru harči,                       xāk-e

       hand     that      NEG-IND-touch-2SG               over     everything,      dirty-BE.3SG

    As you touch everything, it is dirty.
I wonder if there is any other language in which the adverbial clause is negative in form but not in meaning. I searched to find some evidence or some sources which mention this, but I was not successful. I appreciate your comments.Best regards,Mohammad 
Mohammad Rasekh-Mahand Linguistics Department,Bu-Ali Sina University, Hamedan, Iran.Postal Code: 6517838695  https://basu.academia.edu/MohammadRasekhmahand

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