Kings have long arms. 普天之下，莫非王土。

Kings go mad, and the people suffer for it. 君王發狂，百姓遭殃。

Kill two birds with one stone. 一箭雙鵰。

Keep good men company and you shall be of the number. 近朱者赤，近墨者黑。

Justice has long arms. 天網恢恢，疏而不漏。

Judge not from appearances. 人不可貌相，海不可斗量。

Jack of all trades and master of none. 門門精通，樣樣稀鬆。

It takes three generations to make a gentleman. 十年樹木，百年樹人。

It never rains but it pours. 不鳴則已，一鳴驚人。

It is too late to grieve when the chance is past. 坐失良機，後悔已遲。