那时候天气很好，我们去公园玩了很久。

Nà shíhou tiānqì hěn hǎo, wǒmen qù gōngyuán wán le hěn jiǔ.

At that time the weather was great, and we played in the park for a long time.

小时候我们没有手机，那时候都写信联系朋友。

Xiǎoshíhou wǒmen méiyǒu shǒujī, nà shíhou dōu xiěxìn liánxì péngyou.

When we were little, we didn’t have mobile phones; back then we all wrote letters to keep in touch with friends.

那时候已经很晚了，我们决定明天再说。

Nà shíhou yǐjīng hěn wǎn le, wǒmen juédìng míngtiān zài shuō.

It was already very late then, so we decided to talk about it tomorrow.