When I woke up ___ the morning, …
When I woke up ___ Saturday morning, …
什麼啊？都是在講早上，怎麼介系詞不一樣？
時間英文介系詞 in, on, at 你也搞不清楚嗎？
沒關係，只要花 2 分鐘就再也不怕用錯！
in, on, at 都是我們常用的時間介系詞，如果你也常搞混的話，今天 就教你只要用三句話、不到十秒的時間就可以讓大家馬上搞懂這三者的差別，不相信嗎？那就試試看囉！
好，in, on, at 用法的差別就在於：
at：一個準確、特定的時刻
in：月份、季節、年、世紀、一段長而非特定的時間
on：特定日期、星期
邏輯就只是這樣而已！下面幫大家統整常用的時間用法，一起練習看看吧！
Table of Contents
- in + (months, years, centuries, long periods)
- on + (days and dates)
- at + (precise time)
- in the morning / at night
in + (months, years, centuries, long periods)
in the morning
in the afternoon
in the evening
in January
in February
in March, 2015
in the spring
in the summer
in the fall
in the winter
in 2015
in the past year
in the 18th century
in the week
in the past
in the future
on + (days and dates)
on Monday
on Tuesday morning
on Wednesday afternoon
on Thursday evening
on Friday night
on 28, April
on New Year’s Day
on Christmas Day
on the weekend
at + (precise time)
at 07:11
at 10 o’clock
at noon
at noon yesterday
at night
at midnight
at the same time
in the morning / at night
大家有沒有發現一個問題？為什麼我們用 in the morning, in the afternoon, in the evening, 但卻是用 “at” night 呢？其實這個問題很多母語人士也無法真的說個明白，也有各種解釋，但我把我偏好的一種解釋跟大家分享：
如一開始所講，in 用在一段較長而「非特定」的時間；at 用在一段「特定」的時刻，而 night 一般是英語人士表示睡前沒事要做的那段「特定時間」，大概就是晚上九到十二點間，所以相較 morning、afternoon 這些範圍較大且較無特定的時間，我們就相對會用 at night 喔！
還有幾個特例值得注意一下，像 on the weekend 跟 at the weekend 都有人用，on Christmas 跟 at Christmas 也都有人用，使用上還是依習慣為主。
最後為了確認大家都了解，在下面有些小測驗讓大家練習，答案就在文章的最下面喔！
(1) Is Costco open ___ New Year’s Day?
(2) Jack often goes out ___ night.
(3) When I woke up ___ the morning, …
(4) I usually wake up ___ 9:00 ___ the morning.
(5) I suggest that he should come ___ Saturday morning.
(6) VoiceTube was founded ___ January, 2013.
Answers:
(1) on (2) at (3) in (4) at, in (5) on (6) in