ものと思っていた means "I took it for granted that…", and implies that it turned out not to be so. It goes after the plain form of a verb or an い-adjective; a な-adjective takes and a noun takes .
。
I was sure he would come.
。
I was under the impression that she had already gone home.
。
I always assumed my parents would stay healthy forever.
The second half, when there is one, says what the truth was. It is joined on with or , or with .
、。
I had assumed the exam would be easy, but it was actually very difficult.
、。
I thought that shop had closed down, but it was still open.
is a state that lasted up to the moment of discovery – "I had assumed all along" – not "I was thinking at the time". A plain
would be a single thought.
ものと思っていた or と思っていた
reports a belief. Adding
says the speaker never questioned it: it seemed the natural way things would go.
, with
, means the same and is more common in speech.
、。
I had taken it for granted that he would take it on, but I was turned down.
。
I had assumed that everyone in Japan studies English.
Lingaku