問：以下一句，哪兩個選擇正確？──There are 60 crew members / 60 crews on the / on board the passenger liner（客運班輪上，有六十個船員）。
答：Crew指船或飛機的全體船員或機員，一個船員或機員是a crewman或a crew member，不可說a crew。A crew是指一艘船或一架飛機上的所有工作人員，例如：The steamer had a crew of 25（men）/ had 25 crewmen（汽船上有二十五個水手）。讀者示下那一句，當然應說60 crew members而不是60 crews。
至於「在客運班輪上」，英文可說to be on a passenger liner、to be on board a passenger liner或to be aboard a passenger liner，例如：He is on board / aboard / on a luxury liner heading for Iceland（他身在往冰島的豪華班輪上）。
問：英文試卷有一題問：Where are the tigers? 回答假如是They are in the cage，可以得分；但假如是There are three tigers in the cage，卻沒有分，為什麼？
答：那條問題問的是「老虎在哪裏？」答案當然應是「他們在籠子裏（They are in the cage）」；假如回答說「籠子裏有三隻老虎（There are three tigers in the cage）」，那就是答非所問。
假如問題是How many tigers are there in the cage?（籠子裏有幾隻老虎？）那麼，答案才應是：There are three tigers in the cage。