英文的prepositions(介詞)，尤其是用in/on/at表達時間，往往都是憑慣用法而非文法而定，不過也可以記住下面的原則：
以下用in: 月份、年份、年代、早上/下午/黃昏
以下用on: 日期、星期幾、某一天
以下用at: 節日、確實時間、這一刻/那一刻
==============練習：==============
試用以上原則完成下面的題目:
==============答案：==============
以下用in: 月份、年份、年代、早上/下午/黃昏
- in January (在一月)
- in 2000 (在二零零零年)
- in the 1990s (在一九九零年代)
- in the 20th century (在二十世紀)
- in the morning/afternoon/evening (在早上/下午/黃昏)
以下用on: 日期、星期幾、某一天
- on 25 June (在六月二十五日)
- on Wednesday (在星期三)
- on his birthday (在他生日那天)
以下用at: 節日、確實時間、這一刻/那一刻
- at Easter (在復活節)
- at 9:30 a.m. (在九時三十分)
- at noon (在正午)
- at midnight (在午夜)
- at the moment / at that time (在這刻/在那時)
==============練習：==============
試用以上原則完成下面的題目:
- He will graduate _____ June.
- We are going to the beach _____ Saturday.
- She was born _____ 1998.
- The activity will be held _____ 18 August.
- This song was very popular _____ the 1980s.
- I woke up _____ 8:30 a.m. this morning.
- We will talk about this _____ Tuesday.
- We usually have dinner with our family _____ mid-Autumn festival.
- The television was invented _____ the 20th century.
- He is playing football _____ the moment.
==============答案：==============
- in
- on
- in
- on
- in
- at
- on
- at
- in
- at
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