等他发现羊都丢了，已经太晚了。

děng tā fāxiàn yáng dōu diū le, yǐjīng tài wǎn le.

By the time he realized the sheep were all lost, it was already too late.

丢了的那只猫后来自己跑回来了。

diū le de nà zhī māo hòulái zìjǐ pǎo huílái le.

The cat that was lost later came back on its own.

钱包丢了以后，他马上报了警。

qiánbāo diū le yǐhòu, tā mǎshàng bào le jǐng.

After his wallet was lost, he immediately reported it to the police.