The following are general phonetic and grammatical features of the Northern Izu Archipelago dialects, with exceptions and individual variations listed in the island-specific sections.
The Northern Izu Archipelago dialects have a chūrin (中輪 ‘middle rim’) Tokyo standard pitch accent. The vowel sound /e/ is somewhat narrower than in traditional Tokyo dialects, and may lose its distinction with /i/ to become [i].[1][2] For example:
Northern Izu Archipelago dialects are classified under Eastern Japanese, with similar grammar structures to Shizuoka and West Kantō dialects, but also with a strong influence from the traditional Yokohama dialect. As aforementioned, however, the differences from island to island can be extreme. Below are some notable grammatical traits.
The conclusive auxiliary verb is the characteristic Eastern Japanese -da (だ).
The connective form of u-ending Godan verbs experience small tsu (っ) insertion, whilst su-ending Godan verbs experience i-euphony. (The North Izu dialects are the furthest east this trait is found)
Bē (べ) (or bei (べい) on To-shima) is used for persuasion and volition. -U (-う) is also used for volition.
For reasons, -kara (から) and -node (ので) are generally used, with exceptions on To-shima and Mikura-jima (listed below).
The vowels in /ce/ and /co/ are pronounced close to an i and u, respectively.[4]
The diphthong /ei/ is not merged and is pronounced [ei], so that sensei (先生 teacher) is not sensē but sensei.[5]
The negative verb form [nai-stem + n (ん) ] is used.
For conjecture, dan’nō (だんのう) and darubei (だるべい) are used.
-ni (-に) is used as an equivalent to kara and node.
A distinction between the attributive and plain form of verbs can be seen. The attributive form ends with -o, whilst the plain form ends with a -u when particles like bei and na (な) are attached. For assertions, the verb ends with -o.[6] For example:
iru (いる to be)→ iro (いろ)
neru (寝る to sleep)→ nero (寝ろ)
suru (する to do)→ shiro (しろ)
shite iru (している is doing)→ shitero (してろ)
kaku (書く to write)→ kako (書こ).
The Western Japanese past negative form -zatta (-ざった was not) is found.