in と on と at：腑に落ちる徹底比較

01One corner, three meanings

Stand in the corner and the walls surround you — you are inside the room's corner. The café is on the corner: the building sits at the edge where two streets meet, touching that piece of land. Meet me at the corner: the corner is just a pin on the map where two people find each other. The noun never changed; the relationship did.

02Let the verb guide you

Existence verbs like be, live, and stay ask where something is contained: live in Shanghai, stay in a hotel. Contact verbs and positions ask what touches what: lie on the bed, hang on the wall. Meeting and arrival verbs ask for a point: wait at the entrance, arrive at the gate. When two answers both look right, the verb is usually the tiebreaker.

03The time version of the same idea

Time works the same way, from small to big: at 7 o'clock is a pin on the timeline, on Monday is a circled day on the calendar, in July is a container you spend time inside. Learners who see the place picture first usually master the time picture in minutes, because the mental image transfers directly.

04Choose in context, then practice

Before choosing, ask two questions: how is the speaker picturing this place, and what is the verb doing with it? School can be at school (the meeting point), in school (inside the building), or to school (the destination). There is no single correct preposition for school — only the right one for this sentence.

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つながりを作ろう。

選ぶ前に場面を読もう。理由は答えと同じくらい大切。