~たものだ
Recall something you used to do
You’ll be able to look back nostalgically or reflectively on repeated actions and states from the past.

子どものころは、父とこの川でよく魚を釣ったものだ。
kodomo no koro wa, chichi to kono kawa de yoku sakana o tsutta mono da.
What do you think this sentence means?
When I was a child, I often used to fish in this river with my father.
Recall a habitual past action with nostalgia
~たものだ connects to the past plain form of a verb to recall repeated actions or continuous states from the past with nostalgia or deep reflection. It is often paired with time words like 子どものころ or 昔.
小学生のころは、暗くなるまで外で遊んだものだ。
shougakusei no koro wa, kuraku naru made soto de asonda mono da.
In elementary school, I used to play outside until it got dark.
夏休みには、祖母の家でよくスイカを食べたものだ。
natsuyasumi ni wa, sobo no ie de yoku suika o tabeta mono da.
During summer vacation, I often used to eat watermelon at my grandmother's house.
Forming nostalgic past recollections
Attach ものだ to a verb in its plain past (た) form to look back on what used to happen frequently in the past.
学生のころは、夜遅くまで友達と語り合ったものだ。
gakusei no koro wa, yoru osoku made tomodachi to katariatta mono da.
When I was a student, I often talked late into the night with friends.
~たことがある vs ~たものだ
~たことがある says you have done something at least once. ~たものだ says you used to do it often, and looks back on it with feeling.
~たことがある, have done (at least once)
祖父とこの山に登ったことがある。
sofu to kono yama ni nobotta koto ga aru.
I have climbed this mountain with my grandfather.
An experience; maybe only once.
~たものだ, used to (often)
祖父とこの山によく登ったものだ。
sofu to kono yama ni yoku nobotta mono da.
I used to climb this mountain with my grandfather a lot.
A habit, remembered fondly.
学生のころはお金がなくて、毎日のようにインスタントラーメンを食べたものだ。
gakusei no koro wa okane ga nakute, mainichi no you ni insutanto raamen o tabeta mono da.
When I was a student I had no money, so I used to eat instant noodles almost every day.
昔は、駅の近くにあった古い映画館に、友達とよく通ったものです。
mukashi wa, eki no chikaku ni atta furui eigakan ni, tomodachi to yoku kayotta mono desu.
In the old days, I often went with friends to an old movie theater near the station.
以前は、週末になると朝まで友達とカラオケで歌ったものだ。
izen wa, shuumatsu ni naru to asa made tomodachi to karaoke de utatta mono da.
In the past, every weekend I used to sing karaoke with friends until morning.
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