問：叫人安心，應說Please rest assured that...還是Please be rest assured that...？
答：回答這問題之前，宜先談談連繫動詞（link verb）。一般動詞常和副詞（adverb）連用，例如He smiled happily（他高興地微笑）一語，副詞happily修飾動詞smiled。但是，連繫動詞卻常和形容詞連用，例如He was happy（他很高興）一語，那形容詞happy修飾的不是連繫動詞was，而是句子的主詞（subject）he。常見的連繫動詞有be（即is、was等）、seem、become、remain等等。
To rest assured是成語，意思是「不必擔心」，那assured作形容詞用，而rest則是連繫動詞，可用be取代，例如：Please rest assured / Please be assured that the job will be completed in time（請放心，工作會及時做好）。英文不會兩個連繫動詞並用，而be之後的動詞也應加ed，例如be rested等。Please be rest assured當然是錯誤的說法。
問：「斤斤計較」英文怎麼說？
答：「斤斤計較」指過分着重雞毛蒜皮的事，帶貶義。劍橋英文詞典 Cambridge International Dictionary of English petty條下注釋是：（disapproving）Someone who is "petty" or "petty-minded" is annoyed and offended by small and unimportant matters in a way that shows a limited and often selfish mind，即「執着於小事，表現小氣，往往顯得自私」。這petty或petty-minded應是「斤斤計較」的最貼切譯法，例如：It was petty of him to ask his mother to pay her share of the restaurant bill（上餐廳，母親吃的分兒要母親付帳，他真是斤斤計較）。