Grammar Rule in 30 Seconds
Use 'in the' for morning, afternoon, and evening, but 'at' for night and 'on' for weekends.
- Use 'in the' for long parts of the day: 'In the morning'.
- Use 'at' for the end of the day: 'At night'.
- Use 'on' for the weekend in American English: 'On the weekend'.
Overview
in the morning（早上）吃早餐，但at night（晚上）刷TikTok？为什么会有这个微小的词语转换？这是英语中一个非常常见的部分，让很多人感到困惑。这完全是为了使用正确的那个小词——介词——来表示一天中的时间。三个主要的角色是in、at和on。把它们想象成时间的交通信号灯。它们告诉你的听众某事*何时*发生。正确使用它们是一个简单的技巧，能让你的英语听起来更自然，更不像教科书。这是听起来像初学者和听起来对语言感到自在之间的区别。大多数人甚至不假思索地使用它们。在这之后，你将成为他们中的一员。我们这里不是要学习一千个新词汇。我们只是在学习如何正确使用三个小而强大的词来描述我们的日常安排，从早晨的咖啡到深夜的游戏时间。这比你想象的要容易，而且这是那些能真正增强你自信的快速胜利之一。准备好让你的日常听起来完美了吗？How This Grammar Works
in。对于更特定的时间点，你会使用at。这就像谈论整个社区和谈论一个具体地址之间的区别。in the morning、in the afternoon和in the evening就是这些大的时间块。在这些时间段里你做很多事情。你工作、吃饭、学习。但是night的处理方式有点不同。它被看作一个特定的点或一个整体概念。这就是我们说at night的原因。把它想象成一个目的地：你at night到达。同样，我们也为其他精确的时间点使用at，比如at noon（中午）或at midnight（午夜）。然后是on。on是在你通过添加一个日期来变得更具体时使用的。它将一天中的时间固定在一周中的某一天，就像在日历上钉一个钉子。这就是为什么你说on Monday morning（周一早上）或on Friday night（周五晚上）。你拿了一个一般的时间块（morning），然后让它特定于Monday。这就是核心逻辑。即使一开始感觉如此，它也并非完全随机。一旦你看到这个模式——in用于一般的时间块，at用于特定的点，on用于特定的天——它就开始变得清晰了。这就像在手机上将应用分类到文件夹里；一旦你有了系统，就很容易找到你需要的东西。
Formation Pattern
in + the + [一天中的部分]
in the morning
in the afternoon
in the evening
in the afternoon效率最高。”
at + [时间点]
at night
at noon
at midnight
at night会发疯。”
on + [星期几] + [一天中的部分]
on Saturday morning
on Tuesday afternoon
on Sunday night
on Wednesday morning开个Zoom会议吧。”
on + the + [时期]
on the weekend（或在英式英语中为at the weekend）
on weekdays
on the weekend不碰工作。”
night和at搭配，而不是in。
When To Use It
- 谈论你的日常生活： 这是最常见的用法。你
in the morning起床，in the afternoon工作，in the evening放松。你可能at night看Netflix剧集。这就是你构建一天故事的方式。
- 制定计划和安排： 这至关重要。当你给朋友发短信时，你会问：“你
on Friday night有空吗？”或者说：“我们on the weekend喝咖啡吧。”没有这些，几乎不可能安排任何事情。
- 在故事中设置场景： 当你告诉别人发生了什么事时，你用这些短语来设置背景。“我
at night走回家时，看到了最奇怪的事情……”它为你的听众描绘了一幅画面。
- 社交媒体标题： 你的日出Instagram帖子可能会说：“
in the morning一天的完美开始。”一张城市灯光的照片会是：“at night的城市氛围。”这是为你的照片和帖子添加背景的简单方法。
- 商务和学术背景： 在一封专业的电子邮件中，你会写：“报告将在
on Monday morning准备好。”在课堂上，教授可能会说：“截止日期是on Friday的at midnight。”这些在正式交流中是不可或缺的。
Common Mistakes
- 1说
in the night而不是at night： 这是排名第一的经典错误。我们说in the morning、in the afternoon、in the evening……所以逻辑上，in the night也应该可以，对吧？不对。英语在这里决定要与众不同。at night用于一般的时间段。说“我in the night学习”听起来非常诗意，有点戏剧化，就像你在19世纪的小说里一样。日常对话中请坚持使用at night。
- 1在
this、next、last、every前使用介词： 这是另一个大错误。我们说in the morning，但我们说this morning。没有in。我们说on Sunday，但我们说next Sunday。没有on。不要重复！这是一个常见的陷阱。所以，应该是“我last night见到她了”，而不是“我at last night见到她了”。那个多余的介词清楚地表明你还在学习中。
- 1混淆
on和in用于日期： 规则是on用于特定的日子。一个错误是说：“我in Monday morning有个会。”你需要把它固定在某一天上，所以必须是on Monday morning。记住，如果日期的名字在那里（Monday, Tuesday等），介词on也必须在那里。
- 1忘记
the： 小词，大影响。是in the morning，不是in morning。那个小小的the几乎总是用于一天中的一般部分。省略它听起来会不自然。你唯一省略它的情况是当你添加一个日期时，比如on Monday morning。
Contrast With Similar Patterns
in the morningvs.on Monday morning： 这是关于笼统与具体。in the morning指任何一个早晨。这是一个普遍的习惯或关于一天中时间的陈述。“我不是一个morning（早起）的人。”但on Monday morning指一个特定日子的特定早晨。“我on Monday morning有个截止日期。”添加日期（Monday）迫使你从in转换到on。
at nightvs.in the night： 我们已经谈到过这个，但让我们说得更清楚。at night用于一般的时间段。它是一种习惯或状态。“猫头鹰at night活动。”in the night则少见得多，指某个特定夜晚中的某个特定时刻。“我in the night听到了巨大的撞击声。”它暗示在黑暗的几个小时里发生了意想不到的事情。老实说，99%的情况下，你只需要at night。
on the weekendvs.at the weekend： 这不是语法差异，而是地区差异。它们的意思完全相同。on the weekend在美式英语中是标准的。at the weekend在英式英语中很常见。在伦敦使用on the weekend不会引起重大事故，但如果你想听起来像个本地人，at the weekend是正确的选择。这就像fries（薯条）和chips（薯片/薯条）——同样的东西，不同的地方。两者在各自的语境中都是正确的。
- 时间介词 vs. 地点介词： 不要将这些与地点介词混淆。你住
in一个城市，你at公交车站，你把照片放on墙上。这些词是相同的（in、at、on），但它们的工作完全改变了。在这里，我们只讨论它们表示时间的功能。考虑地点只会让你困惑。语境就是一切！
Quick FAQ
at night？感觉很随意！night（夜晚）和day（白天）被视为24小时周期中的两个主要的、几乎相反的点。所以，英语将night视为一个特定的时间点，类似于at noon或at midnight，而不是像the morning那样的更长的时间块。on morning吗？the。必须是in the morning。你唯一省略the的情况是如果你指定了日期，比如on Friday morning。at evening或at afternoon呢？in一起用。是in the evening和in the afternoon。at是为night、noon和midnight保留的。on the night of the party可以吗？on是正确的，因为你正在指定一个特定的夜晚——属于派对的那个夜晚。这和说on Monday night类似。on weekends（复数，没有the）。可以吗？on the weekend指作为一个整体时间块的周末。on weekends指每个周末都发生的重复性习惯。例如，“我on the weekend放松”（这个即将来临的周末）vs.“我on weekends踢足球”（每个周末）。at。你会说at dawn或at dusk。例如，“鸟儿at dawn开始歌唱。”Standard Prepositional Phrases for Time
| Preposition | Article | Time Period | Example |
|---|---|---|---|
|
In
|
the
|
morning
|
In the morning
|
|
In
|
the
|
afternoon
|
In the afternoon
|
|
In
|
the
|
evening
|
In the evening
|
|
At
|
(none)
|
night
|
At night
|
|
On
|
the
|
weekend
|
On the weekend (US)
|
|
At
|
the
|
weekend
|
At the weekend (UK)
|
Meanings
These are fixed phrases used to describe when an action happens during the 24-hour cycle or the week.
General Daily Periods
Using 'in the' to describe the three main blocks of the day.
“I study in the afternoon.”
“She works in the evening.”
Nighttime
Using 'at' to describe the period of darkness or sleep.
“I sleep at night.”
“The stars shine at night.”
The Weekend
Using 'on' to describe Saturday and Sunday.
“I relax on the weekend.”
“We go to the park on the weekend.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Subject + Verb + [Prep Phrase]
|
I run in the morning.
|
|
Negative
|
Subject + do not + Verb + [Prep Phrase]
|
I do not run at night.
|
|
Question
|
Do + Subject + Verb + [Prep Phrase]?
|
Do you run on the weekend?
|
|
Short Answer (+)
|
Yes, I do.
|
Yes, I do.
|
|
Short Answer (-)
|
No, I don't.
|
No, I don't.
|
|
Plural Habit
|
Prep + [Period]s
|
I work on weekends.
|
正式程度
I shall attend to the matter in the morning. (work task)
I will do it in the morning. (work task)
I'll do it in the morning. (work task)
Doing it AM. (work task)
The Daily Cycle
In the...
- morning morning
- afternoon afternoon
- evening evening
At...
- night night
On the...
- weekend weekend
In vs. At vs. On
Choosing the Right Preposition
Is it Morning, Afternoon, or Evening?
Is it Night?
Is it the Weekend?
Time Categories
Daylight
- • In the morning
- • In the afternoon
Twilight
- • In the evening
Darkness
- • At night
Rest
- • On the weekend
按水平分级的例句
I drink milk in the morning.
I drink milk in the morning.
She plays in the afternoon.
She plays in the afternoon.
They sleep at night.
They sleep at night.
I see you on the weekend.
I see you on the weekend.
Do you go to the gym in the evening?
Do you go to the gym in the evening?
It is very quiet at night.
It is very quiet at night.
We don't work on the weekend.
We don't work on the weekend.
I usually wake up early in the morning.
I usually wake up early in the morning.
I'll finish the report in the afternoon.
I'll finish the report in the afternoon.
The owls are very active at night.
The owls are very active at night.
What are you doing on the weekend?
What are you doing on the weekend?
I prefer reading in the evening when it's quiet.
I prefer reading in the evening when it's quiet.
The city looks beautiful in the evening light.
The city looks beautiful in the evening light.
He often works late at night to meet deadlines.
He often works late at night to meet deadlines.
We are planning a trip on the weekend.
We are planning a trip on the weekend.
In the morning, the fog usually clears by ten.
In the morning, the fog usually clears by ten.
The atmosphere shifts palpably in the evening.
The atmosphere shifts palpably in the evening.
Strange things happen in the middle of the night.
Strange things happen in the middle of the night.
I find myself most productive in the morning hours.
I find myself most productive in the morning hours.
The museum is particularly crowded on the weekend.
The museum is particularly crowded on the weekend.
One's resolve often wavers at night.
One's resolve often wavers at night.
The shadows lengthen in the evening, casting a somber mood.
The shadows lengthen in the evening, casting a somber mood.
The quietude found in the morning is unparalleled.
The quietude found in the morning is unparalleled.
The policy will be reviewed on the weekend to ensure compliance.
The policy will be reviewed on the weekend to ensure compliance.
容易混淆
Learners don't know when to use 'the'.
Mixing prepositions when combining them.
Not knowing when evening ends and night begins.
常见错误
I sleep in the night.
I sleep at night.
In morning I drink coffee.
In the morning I drink coffee.
I play in weekend.
I play on the weekend.
At the afternoon I study.
In the afternoon I study.
I see you in Monday morning.
I see you on Monday morning.
She works at the night.
She works at night.
I am busy in the weekend.
I am busy on the weekend.
I woke up at the night.
I woke up in the night.
On the morning of Friday...
On Friday morning...
I'll be there in the night.
I'll be there at night.
In the weekend's duration...
Over the weekend...
句型
I ___ in the morning.
Do you ___ on the weekend?
It is ___ at night.
She usually ___ in the afternoon.
We met ___ in the evening.
Real World Usage
See u in the afternoon!
I will send the files in the morning.
Best vibes in the evening.
We have an opening on the weekend.
Arrive at the hotel at night.
Are you available to work in the evening?
Rain expected in the afternoon.
We are fully booked on the weekend.
The 'The' Rule
Night is Special
Weekend Variations
Greeting vs. Time
Adding Days
Smart Tips
Remember: 'In' needs 'the', but 'At' (for night) does not.
The day is the boss! Always use 'on' if a day (Monday, Tuesday) is present.
If you are still awake and active, it's 'evening'. If you are sleeping or it's very dark, it's 'night'.
Mirror their 'weekend' preposition. 'At' for UK, 'On' for US.
发音
Linking 'In the'
The 'n' in 'in' often slides into 'the'.
Stress on Time
Stress the time word (morning), not the preposition.
Rising on questions
Do you work at NIGHT? ↗
Asking for confirmation.
记住它
记忆技巧
In the light (morning/afternoon/evening), At the night (just 'at night').
视觉联想
Imagine a large box labeled 'IN' containing a sun rising, a high sun, and a setting sun. Then imagine a small dot labeled 'AT' with a moon.
Rhyme
In the morning, afternoon, and evening too / At night is what the sleepy people do.
Story
I wake up 'in the' morning box, work 'in the' afternoon box, and relax 'in the' evening box. But when the stars come out, I stand 'at' the point of night.
Word Web
挑战
Write down three things you do: one in the morning, one at night, and one on the weekend.
文化笔记
Americans almost exclusively use 'on the weekend'.
British speakers frequently use 'at the weekend'.
In international business, 'in the morning' usually refers to 9 AM - 12 PM.
The use of 'in' for day parts comes from the Old English 'on' or 'in' meaning 'during'.
对话开场白
What do you usually do in the morning?
Do you prefer working at night or in the morning?
What are your plans on the weekend?
Is it safe to walk in your city at night?
How does your routine change on the weekend?
日记主题
常见错误
Test Yourself
I drink coffee ___ the morning.
Select the natural English sentence.
Find and fix the mistake:
I go to the park in the weekend.
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Match each item on the left with its pair on the right:
You should say 'at the morning'.
A: When do you exercise? B: I exercise ___ the afternoon.
Create the sentence.
Score: /8
练习题
8 exercisesI drink coffee ___ the morning.
Select the natural English sentence.
Find and fix the mistake:
I go to the park in the weekend.
evening / the / in / study / I
1. Morning, 2. Night, 3. Weekend
You should say 'at the morning'.
A: When do you exercise? B: I exercise ___ the afternoon.
Create the sentence.
Score: /8
Practice Bank
12 exercisesI usually exercise ___ the morning.
Do you work in night?
Choose the correct sentence:
Translate into English: 'Ji žiūri filmus vakare.'
Arrange these words into a sentence:
Match the time expressions with the correct preposition:
They play football ___ the afternoon.
I like to jog on night.
Choose the correct sentence:
Translate into English: 'Ar tu laisvas savaitgalį?'
Arrange these words into a sentence:
The kids often play outside ___ the afternoon.
Score: /12
常见问题 (8)
It's a historical exception. 'Morning' is seen as a duration (a box of time), while 'night' was historically seen as a single point in time.
Yes, but only for specific events, like 'I heard a noise in the night.' For habits, always use 'at night'.
Both are correct. 'On' is American; 'At' is British. Use the one that matches the dialect you are learning.
No. We say 'at night', not 'at the night', unless we are talking about one specific night.
Use 'at'. 'At noon'.
Use 'on'. 'On Monday morning'. The day of the week always takes 'on'.
Not quite. 'Evening' is usually before you go to bed (5 PM - 9 PM). 'Night' is when you sleep or when it is very late.
No, say 'on weekends' (plural) or 'on the weekend' (singular).
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
por la mañana / en la mañana
Spanish uses the same preposition for night (por la noche), but English switches to 'at'.
le matin / le soir
English requires the preposition 'in' or 'at'.
am Morgen / in der Nacht
English and German prepositions for night and morning are almost exactly swapped!
asa ni (朝に)
English has three different prepositions (in/at/on) where Japanese mostly uses one.
fi al-sabah (في الصباح)
Arabic also uses 'fi' for night, whereas English switches to 'at'.
zǎoshàng (早上)
English requires a prepositional phrase; Chinese just uses the word.
