當你使用When in Rome, do as the Romans do.（入境隨俗）英文諺語時，你是否注意此諺語含有兩個文法概念？
概念一：祈使句（imperative sentence）
Line up, please. 請排隊Don’t cut in line. 別插隊
Do as the Romans do. 照羅馬人方法行事。
概念二：保留副詞連接詞之分詞構句（participle clause）
保留副詞連接詞之分詞構句：
When
While V-ing（主動）
As ＋ P.P.（被動）， S＋V（省略副詞子句中的主詞）
Although 片語
If
Unless
Once
When I travel to another country, I always keep in mind “When in Rome, do as the Romans do.”
= When traveling to another country, I always keep in mind “When in Rome, do as the Romans do.”（當我旅遊到某個國家時，我總是牢記「入境隨俗」。）
When in Rome, do as the Romans do.（入境隨俗）
= When (you are) in Rome, (you) do as the Romans do.
When (we are) praised, we feel happy. （當被讚美時，我們感到快樂。）
