同どう 士し Fellow members; among themselves 同どう 士し groups people or things that share a type, situation, or relationship. It often draws attention to what those members are or do in relation to one another.
Where it fits Neutral Spoken Written
Common in both conversation and writing. The shared category or relationship should be meaningful in context; this is not simply a general plural ending.
Shared membership and mutual relationships The noun before 同どう 士し tells you what the members have in common. They may belong to the same category, be in the same situation, or stand in the same kind of relationship. The expression can refer to two people or to a larger group.
What the members share These examples move from a pair to a larger group and from a shared relationship to a shared situation.
二人ふたり はとも だち どう し です。
The two of them are friends.
AnalyzeThe point is the relationship between the two people, not merely that both are friends with someone.
しょ たい めん どう し なので、最さい 初しょ は会かい 話わ が少すこ しぎこちなかった。
Since they were meeting each other for the first time, the conversation was a little awkward at first.
Analyzeりゅう がく せい どう し が集あつ まって、生せい 活かつ 上じょう の悩なや みを話はな し合あ った。
The international students gathered and discussed difficulties in their daily lives.
AnalyzeThis can describe any number of international students; it does not imply exactly two.
Using the whole expression as a noun Once formed, the entire expression behaves like a noun. It can take particles, or it can be followed by の to describe a following noun.
Relations among the members がく せい どう し こう りゅう を増ふ やすため、月つき に一いち 度ど イベントを開ひら いている。
We hold an event once a month to increase interaction among students.
Analyzeとなり どう し が協きょう 力りょく して、庭にわ の落お ち葉ば を片かた づけた。
The neighbors worked together to clear away the fallen leaves in their yards.
AnalyzeAttach it directly Do not place の between the base noun and 同どう 士し . Say 学がく 生せい 同どう 士し , not 学がく 生せい の 同どう 士し . Add の only after the completed expression when another noun follows, as in 学がく 生せい 同どう 士し の 交こう 流りゅう .
Not just a plural or companion marker たち simply forms a plural or associated group. The particle と can identify a companion in one action. By contrast, 同どう 士し presents the participants as matching or fellow members and often highlights their relationship with one another.
田た 中なか さんは先さき に帰かえ りました。
Mr. Tanaka and the others went home early.
AnalyzeThis only identifies a group; it says nothing about a mutual relationship within it.
田た 中なか さんと森もり さんはどう りょう どう し です。
Mr. Tanaka and Ms. Mori are colleagues.
AnalyzeHere the suffix explicitly characterizes the relationship between the two people.
More examples 年ねん 齢れい の近ちか いしゃ いん どう し で、新あたら しい企き 画かく について話はな し合あ った。
Employees of similar ages discussed the new project among themselves.
Analyze同おな じ趣しゅ 味み を持も つもの どう し 、すぐに話はなし が合あ った。
As people who shared the same hobby, they immediately hit it off.
Analyzeこ どう し に、大人おとな がすぐ口くち を出だ す必ひつ 要よう はない。
Adults do not need to interfere immediately in a quarrel between children.
Analyzeおや こ どう し で参さん 加か できる料りょう 理り 教きょう 室しつ を開ひら きます。
We will hold a cooking class that parent-child groups can attend together.
Analyzeどう し が互たが いの健けん 闘とう をたたえた。
The rivals praised each other's efforts.
Analyzeせん もん か どう し でも、この問もん 題だい については意い 見けん が分わ かれている。
Even among specialists, opinions are divided on this issue.
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