A：針對這問題，筆者去找了一些資料，發現有幾個類似的例子 (也許還有更多)，茲說明如下：
1. in future：日後，往後，今後
in the future：未來，將來
- Try to do better in future. (今後要努力做得更好)
- In future, make sure you go to school on time. (今後要確定準時上學)
- What will you do in the future? (你將來要做什麼?)
- We’re hoping to move to the United States in the not too distant future. (我們希望在不太久的將來搬到美國去住)
2. in charge of：主管，負責，看管 (含有主動的意味)
in the charge of：在…主管，負責，看管之下 (含有被動的意味)
- The nurse is in charge of the old men. (這位護士負責照料這些老人)
- The old men are in the charge of the nurse. (這些老人由這位護士負責照料)
- Who’s in charge of the department? (誰負責這一部門?)
3. in case of：萬一…發生，如果發生…，要是…，遇到…的時候
in the case of：就…而論，就…來說，至於 (這裡 case 意為「情況」、「實例」)
- In case of fire, ring the bell. (如果發生火災，請速按鈴)
- In case of any difficulties, you must consult with your aunt. (萬一碰到困難，你必須跟你阿姨商量)
- Many people want to be famous singers and make a lot of money, but in the case of me, it’s otherwise. (許多人都想成為名歌手，賺很多錢，但就我而言，情況則不然)
4. in hospital：住院，在醫院裡接受醫療
in the hospital：在醫院裡，指在醫院這個建築物裡面
注意：美式英語也用 in the hospital 來表示 in hospital 的意思 (in university 和 in the university 也有同樣的情況)。除 hospital 外，school, church, market, college, court, prison 等也有類似的用法。當名詞前有 “the” 時，指的是地點、地方、實際的建築物，在用作抽象名詞時，指的則是建築物的功用，說明人在那裡從事相應的活動。
- His father is in hospital. (他父親在住院)
- “Where is John?” “He is in the hospital. He goes there to see his sick friend.” (「約翰去哪裡?」「他在醫院，他去看他生病的朋友」)
- I’m a high school student, and I go to school every day. (我是個中學生，每天上學)
- My father sometimes goes to the school to speak to the headmaster. (我父親有時會去學校跟校長談話)
- Are they in church? (他們在做禮拜嗎?)
- Are they in the church? (他們在教堂裡面嗎?)
- He is in prison. (他在坐牢)
- He is in the prison. He is there to see his brother. (他在監獄裡面，他去那裡看他的弟弟)