常事

kàn shū dào shēn yè duì tā lái shuō zhè shì cháng shì

看书到深夜，对他来说这是常事。

Reading far into the night is almost a matter of everyday practice with him.

zhè shì shēng huó zhōng de cháng shì

这是生活中的常事。

It's of habitual occurrence in daily life.

shèng bài nǎi bīng jiā cháng shì

胜败乃兵家常事。

For a military commander, winning or losing a battle is a common occurrence.

suī rán tā zuó tiān shàng xué chí dào le dàn zhè duì tā lái shuō shì cháng shì

虽然她昨天上学迟到了，但这对她来说是常事。

She was late for school yesterday, as is often the case with her.