たものだ

A plain past tense verb + ものだ can be used to express the English equivalent of "used to", referring to an action that used to be performed. It's often used in a nostalgic fashion to reminisce about the past.

子供の頃は、毎年夏休みになると、家族と海に泳ぎに行ったものです。
Every year when I was a kid, when it was summer break I would go swimming in the ocean with my family.

高校の頃は、クラスの後いつもリーさんと映画館に行ったものだな。
Back in high school, after class I always used to go to the movies with Lee-san.

携帯電話がなかった頃は、よく友達を待たせたり、逆に待たせられたりしたものだが、今はすぐ連絡できるのでとても便利だ。
Back when we didn't have cell phones, I often used to make my friends wait, or the opposite, was made to wait by my friends, but now I since I can quickly contact them it's really convenient.

トキが子猫の時は、ドアの近いに小さい壺に寝たものだねぇ。
When Toki was a kitten, he used to sleep in the little pot near the door.