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Shirimono
GRAMMAR
〜ものと思っていた
was under the impression that
Explanation
NOTE

〜ものと思っていた means was under the impression that — you assumed something was true in the past.

会議かいぎ明日あしたものとおもっていた
I was under the impression that the meeting was tomorrow.
NOTE

It often implies the assumption turned out to be wrong — reality differed from what you believed.

みせいているものとおもっていた
I was under the impression that the store was open.
The past continuous 思っていた shows the belief was held over a period before the truth was known.
NOTE

Attach ものと思っていた to a verb in plain form, the form stating the situation you assumed.

STRUCTURE
V
ものと思っていた
かれはもうかえったものとおもっていた
Kare wa mou kaetta mono to omotte ita.
I was under the impression that he had already gone home.
テストは来週らいしゅうものとおもっていた
Tesuto wa raishuu da mono to omotte ita.
I was under the impression that the test was next week.
彼女かのじょものとおもっていた
Kanojo wa kuru mono to omotte ita.
I was under the impression that she would come.

Practice exercises

1
会議かいぎ中止ちゅうしになったものとおもっていた
I was under the impression that the meeting had been cancelled.
Answer
ものとおもっていた
2
かれ英語えいごはなせるものとおもっていた。
I was under the impression that he could speak English.
Answer
ものと
3
宿題しゅくだいはもうわっているものとおもっていた
I was under the impression that the homework was already done.
Answer
ものとおもっていた
4
かれあさといわずよるといわず、ゲームをたのしむものとおもっていた
I was under the impression that he enjoyed games both morning and night.
Answer
ものとおもっていた
5
かれ不平ふへいだの不満ふまんだのをならべるものとおもっていた
I was under the impression that he would list complaints and dissatisfactions.
Answer
ものとおもっていた
6
かれはもうかえったものとおもっていた
I was under the impression that he had already gone home.
Answer
ものとおもっていた
7
この仕事しごとだれでもできるものとおもっていた
I was under the impression that anyone could do this job.
Answer
ものとおもっていた
8
かれ発言はつげん悪意あくいがあるものとおもっていた
I was under the impression that his remarks had ill intent.
Answer
ものとおもっていた