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The dialect or dialects of Hokkaido (北海道方言 Hokkaidō-hōgen?), commonly called Hokkaidō-ben (北海道弁?), originate in relatively recent settlement from mainland Japan. The greater part of Hokkaidō was settled from a mix of areas from the Meiji period on, especially from the Tōhoku and Hokuriku regions, so various Japanese dialects mixed together on Hokkaidō.
The relationship of Hokkaidō dialect to the rest of Japanese—and whether there even is a coherent Hokkaidō dialect—are debated. Shibata (2003) mentions three theories:
- Inland varieties are part of Kantō dialect, while coastal varieties are part of Tōhoku dialect
- There is a single Hokkaidō dialect, which is a distinct branch of Eastern Japanese
- There is a Hokkaidō dialect, but it descends from Niigata dialect (one of the Tōkai–Tōsan dialects), a transitional form with Western Japanese features.
Tōhoku influence is strongest in coastal areas, especially on Oshima Peninsula in the south, where the local variety is commonly called Hama-kotoba (浜言葉?, seashore speech). The urban dialect of Sapporo is quite close to Standard Japanese. Western features may have been brought by merchants from Kansai and Hokuriku with the kitamaebune trade routes.
Also spoken on Hokkaidō is the Ainu language, which was widely spoken there before Japanese settlement and still has a few elderly speakers.
- The -re imperative form for ichidan verbs and s-irregular verb instead of Standard form -ro
- The volitional and presumptive suffix -be; from Tohoku dialect
- The presumptive suffix -sho or -ssho; contraction of Standard polite presumptive form deshō
- tōkibi for "corn" instead of Standard tōmorokoshi; also used in many Japanese dialects
- shibareru for "to freeze, freezing cold" instead of Standard kogoeru; from Tohoku dialect
- nageru for "to throw away" instead of Standard suteru; from Tohoku dialect; nageru means "to throw" in Standard
- waya for "fruitless, no good" instead of Standard dame; from Western Japanese
- shitakke for casual "good-bye" or "then" instead of Standard (sore) ja
- namara for "very" instead of Standard totemo; since the 1970s from Niigata dialect