JLPT N3 Grammar List
used to do something; of course
You usually use ものだ to state an obvious fact, or to say that you used to do something in the past.
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Verb-casual, past + ものだ: used to do something
Verb-dictionary form + ものだ: social norm/an obvious fact
子供のとき、よく川で遊んだものです。
Kodomo no toki, yoku kawa de asonda monodesu.
I used to play by the river a lot when I was a kid.
借りたものは返すものです。
Karita mono wa kaesu monodesu.
You should pay what you owe.
習慣というものは恐ろしいものです。
Shūkan to iu mono wa osoroshī monodesu.
The force of habit is strong.
See also