Kotomora
JLPT N3Construction
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かとおもったMistaken impression or unexpected outcome

Reports an earlier impression or expectation that turned out to be wrong. With a feared event, it can also mean that the event seemed about to happen but ultimately did not.

An impression corrected by reality

The speaker first interpreted the situation one way, then learned or experienced something different. A complete example should normally reveal that difference; without it, the sentence may sound like an ordinary report of what someone thought.

Mistaken identity and degree

The correction may concern a person's identity, the category of something, or the expected degree of a quality.

あのひとてんいんかとおもったが、じつてんちょうだった。

I thought that person was a store clerk, but they were actually the manager.

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このはこはもっとおもいかとおもったが、がいかるかった。

I thought this box would be heavier, but it was surprisingly light.

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When something almost seemed to happen

With a feared or dramatic event, the construction often describes a strong reaction: for a moment, it felt as though the event was about to happen. The usual implication is that it did not actually happen.

かいだんあしすべらせ、ころぶかとおもったが、すりにつかまってたすかった。

I slipped on the stairs and thought I was going to fall, but I grabbed the handrail and was all right.

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Three patterns that look similar

かとおもった ends the report of a mistaken impression. Adding creates かとおもったら, a separate connector used for rapid or surprising sequence. Plain おもった can merely report a belief without showing that it was wrong. A volitional verb followed by かとおもった belongs to a separate pattern about considering whether to act.

More examples

そとさむいかとおもったが、なたはあたたかかった。

I thought it would be cold outside, but it was warm in the sun.

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かいちゅうかとおもったが、ていどおりはじまった。

I thought the meeting had been canceled, but it started as scheduled.

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もうわったかとおもったが、さいだいのこっていた。

I thought it was already over, but the final task was still left.

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けんはもっとむずかしいかとおもったけれど、ほんもんだいおおかった。

I thought the exam would be harder, but it had many basic questions.

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おおきなおとがしたので、まどれたかとおもったが、だった。

There was a loud noise, so I thought the window had broken, but it was undamaged.

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でんしゃおくれるかとおもったが、ぎりぎりった。

I thought I was going to miss the train, but I made it just in time.

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やく今日きょうかとおもいましたが、明日あしたでした。

I thought the reservation was for today, but it was for tomorrow.

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