supposed
想定されている
解説 Definition
supposed は「想定されている」「そうであるはずの」という意味です。よく be supposed to の形で、予定・義務・期待されていることを表します。
Expected, intended, or generally understood to be true or to happen. In the construction be supposed to, it expresses a plan, duty, rule, or expectation, often indicating what someone should do or what is scheduled to occur.
覚え方のコツ Memory Tip
supposed は suppose「想定する」の過去分詞ですが、be supposed to のまとまりで覚えるのが実用的です。予定なら The bus is supposed to arrive、義務・期待なら You are supposed to bring your book のように使います。「そうなる前提になっている」から「～する予定・ことになっている」へ意味をつなげましょう。
Supposed is the past participle of suppose, but the most useful memory unit is be supposed to. Think of something being “placed as an assumption”: if a bus is supposed to arrive at six, six o’clock is the expected schedule; if you are supposed to bring a book, bringing it is your duty or an established rule. The phrase can therefore express plans, expectations, or obligations depending on context. Keep it separate from the ordinary past verb supposed, as in I supposed that he knew, meaning “I assumed.”
例文
The bus is supposed to arrive at six.
そのバスは6時に到着する予定です。
You are supposed to bring your book.
あなたは本を持ってくることになっています。
This room is supposed to be quiet.
この部屋は静かにしておくことになっています。
supposed の類義語・関連語
supposed の語源・成り立ち Etymology
古フランス語 supposer からで、ラテン語 sub-（下に）+ ponere（置く）が語源。「下に置く＝仮に土台として据える」から「想定する・仮定する」の意味になった。be supposed to で義務の意味になるのは「そう前提されている」という含意から。関連語: compose（組み立てる）、propose（提案する）。
Supposed comes from suppose plus the participial ending -ed. Suppose entered English through Old French supposer and is historically connected with Latin sub-, “under,” and ponere, “to put or place.” The underlying image is of placing an idea beneath an argument as an assumption. From “assumed or taken as true,” supposed developed meanings involving expectation and accepted arrangements. This explains be supposed to: an action is treated as expected, scheduled, or required under an established assumption.
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