Ⅰ. at school表示“在學校、在上學”相對于在家里或在校外。如：
① My son is at school now. He is not at home or somewhere else. 我兒子現在在學校，他不在家，也不在別的地方。
② When my brother was at school, he studied very hard. 在學校時，我兄弟學習很用功。
�、�. in school “在求學、在上學”相對于有工作。如：
My daughter still in school She doesn’t work。我女兒還在上學，她不在工作。
[注]：①和②用at school 強調所在場所或時間。③中的in school 則強調主語的身份是學生。因此，in school. 和at school的著重點不一樣，通常不互換使用。
Ⅲ. In a / the school “在學校”，不一定指上學。類似的還有：
in hospital “生病住院”
in a / the hospital表“在醫院”(工作或探視病人等)
at table “在吃飯”
at a / the table “在桌邊”(有可能在聊天或看報)
① Is your friend in school? 你的朋友在上學嗎?
① Your friend looked for you in the school just now. 剛才你的朋友在學校里找你。
② Children are often in hospital when they are young. 孩子們小的時候經常生病住院。
�、� She is a good doctor in the hospital .她是醫院里的一名好大夫。
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