やるべきこと
覚え方のコツ Memory Tip
do「する」を名詞化した do「すべき行為」の複数形で、dos とつづります。do の動詞の活用形ではなく、ふつう dos and don'ts「やるべきことと、してはいけないこと」という対で使われます。旅行、面接、職場などの rules や advice を、推奨事項と禁止事項に分けた一覧を思い浮かべて覚えます。
Here do is being used as a countable noun meaning an action that is recommended or acceptable, and dos is its plural. It is not a verb form. Remember it through the standard pair dos and don'ts: the dos are the actions to follow, while the don'ts are the actions to avoid. Picture a short guide for a job interview, a workplace, or a foreign country, divided into two columns. Although the spelling do's is also sometimes seen, dos is the usual plain plural spelling in edited text.
dos の類義語・関連語
dos の語源・成り立ち Etymology
古英語 dōn（行う・なす）に由来する do の複数形。ゲルマン祖語 *dōną に遡り、印欧語根 *dhē-（置く・する）が起源。「やるべきこと」のリストとして dos and don'ts の形で定着した。関連語：deed（行為）、done（完了した）。
Dos is the plural of the noun do, which developed from the common verb do. The verb descends from Old English dōn, “to perform, make, or put,” from a Germanic source ultimately associated with the Indo-European root meaning “to put” or “to place.” The noun sense refers to something that should be done. Its plural became especially familiar in the fixed phrase dos and don'ts, denoting recommended and prohibited actions.
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