Reasons and excuses: 〜ので, 〜のに, 〜けど and 〜し
Give reasons politely with 〜ので, show surprise or disappointment with 〜のに, soften what you say with 〜けど and 〜が, list several reasons with 〜し — and call work when your train stops, with the kanji 用, 悪, 止, 通 and 道.