天黑了。
tian hei le.
Getting dark.
Literally: Sky black/dark [particle for change of state].
In 15 Seconds
- Used to observe that evening has arrived and the sky is dark.
- Often implies it is time to go home or finish activities.
- The 'le' particle indicates a transition from light to dark.
Meaning
This phrase is used to point out that the sun has gone down and the sky is turning dark. It is often a gentle hint that it is time to wrap things up and head home.
Key Examples
3 of 6Leaving the park with a friend
天黑了，我们回家吧。
It's getting dark, let's go home.
Reminding a hardworking colleague to leave
天都黑了，你还不下班吗？
It's already dark, aren't you finishing work yet?
A mother calling her child inside
天黑了，别在外边玩了。
It's dark now, stop playing outside.
Cultural Background
The phrase reflects the traditional agrarian rhythm of 'working at sunrise and resting at sunset.' In modern cities, it serves as a common linguistic 'nudge' to transition from work or social activities to evening routines or heading home.
The 'Polite Exit'
In China, directly saying 'I want to leave' can be blunt. Use '天黑了' as a natural, external reason to start your departure.
Don't forget the 'Le'
Saying just '天黑' sounds like a noun phrase ('dark sky'). You need the '了' to make it a complete thought meaning 'It has become dark.'
In 15 Seconds
- Used to observe that evening has arrived and the sky is dark.
- Often implies it is time to go home or finish activities.
- The 'le' particle indicates a transition from light to dark.
What It Means
天黑了 is a simple, everyday observation. 天 means sky. 黑 means black or dark. The 了 at the end is the magic ingredient. It tells you a change has happened. It wasn't dark before, but now it is. It is like saying, "Look, the day is over."
How To Use It
You use this when you notice the light fading. It is a very versatile sentence. You can say it to yourself while looking out a window. You can say it to a friend to suggest leaving the park. It is a natural conversation starter or closer. Just drop it into a chat when the lamps start flickering on.
When To Use It
Use it when you are hiking and need to find the trail. Use it at the office to tell a coworker to stop working. It is perfect for parents telling kids to come inside. If you are on a date and want to suggest dinner, this works great. It feels soft and observational, not demanding. It is the ultimate "polite exit" phrase.
When NOT To Use It
Don't use it if it is already midnight. At that point, the sky has been dark for hours. Use 半夜了 (it's midnight) instead. Avoid using it in a windowless room where you can't see the sky. People might think you are being poetic or just very confused. Also, don't use it to describe a power outage. That is 停电了, not the sky getting dark.
Cultural Background
In Chinese culture, there is a strong sense of "returning." There is an old saying about working when the sun rises and resting when it sets. 天黑了 triggers a biological and cultural clock. It implies safety and family. It suggests that the outside world is closing and the private, home world is opening. It is a cozy phrase that signals the end of the public day.
Common Variations
You might hear 天快黑了 which means "it's almost dark." This adds a bit of urgency. If you want to be more descriptive, you can say 天色暗了. This is a bit more literary and elegant. For a very casual vibe, some might just say 黑了 while pointing at the window. But 天黑了 remains the gold standard for daily life.
Usage Notes
This is a neutral, high-frequency phrase. It is safe to use in almost any social situation. The only 'gotcha' is ensuring you use the 'le' particle to indicate the transition of time.
The 'Polite Exit'
In China, directly saying 'I want to leave' can be blunt. Use '天黑了' as a natural, external reason to start your departure.
Don't forget the 'Le'
Saying just '天黑' sounds like a noun phrase ('dark sky'). You need the '了' to make it a complete thought meaning 'It has become dark.'
The 'Return' Instinct
Chinese culture places high value on 'Home' (家). This phrase often triggers a collective instinct to seek shelter and family time.
Examples
6天黑了，我们回家吧。
It's getting dark, let's go home.
A very common way to suggest ending an outing.
天都黑了，你还不下班吗？
It's already dark, aren't you finishing work yet?
Shows concern for a coworker staying late.
天黑了，别在外边玩了。
It's dark now, stop playing outside.
A classic parental command for safety.
天黑了，我们今天的会议就到这里吧。
It has become dark; let's conclude today's meeting here.
Used as a polite reason to end a long professional session.
哎呀，天黑了，我忘了开灯。
Oops, it's dark, I forgot to turn on the lights.
A relatable moment of forgetfulness at home.
天黑了，你快进去吧，外面冷。
It's dark now, go inside quickly, it's cold outside.
Expresses care and protection for a loved one.
Test Yourself
Choose the correct particle to show the change of state in the sky.
天黑___。
The particle '了' (le) indicates that the state of the sky has changed from light to dark.
Complete the sentence to suggest going home because it's late.
天黑了，我们___吧。
'回家' (huí jiā) means to go home, which is the most common follow-up to noticing it is dark.
🎉 Score: /2
Visual Learning Aids
Formality of '天黑了'
Used with family and friends.
妈，天黑了。
Standard observation in most settings.
天黑了，该走了。
Polite way to end a business dinner.
天色已晚，我们回吧。
When to say '天黑了'
Hiking outdoors
Safety reminder
Office overtime
Hinting to leave
At the park
Ending a playdate
Driving
Turning on headlights
Practice Bank
2 exercises天黑___。
The particle '了' (le) indicates that the state of the sky has changed from light to dark.
天黑了，我们___吧。
'回家' (huí jiā) means to go home, which is the most common follow-up to noticing it is dark.
🎉 Score: /2
Frequently Asked Questions
12 questionsIt literally translates to 'Sky blacked' or 'The sky has become dark.' The 了 indicates a change in the environment.
Only if there is a solar eclipse or a very heavy storm! Otherwise, it is strictly for evening time.
No, it is neutral. However, if you are hinting that you want to leave, it's better to say 天色不早了 (the hour is getting late) for more politeness.
You can say 天快黑了 (Tiān kuài hēi le). The 快 means 'soon' or 'almost'.
No, it is standard Mandarin. It is used by everyone from children to news anchors in casual contexts.
天黑了 is an observation of the time. 晚安 (Wǎn'ān) is a specific greeting meaning 'Goodnight' used right before sleeping.
Usually no. For a room, you would say 屋里很黑 (It's dark in the room). 天 specifically refers to the sky/weather.
Yes, you can say 夜幕降临 (Yèmù jiànglín), which means 'the curtain of night is falling.' It's very beautiful but rarely used in speech.
It serves as a socially acceptable 'buffer' to explain why you are leaving without making it about the people you are with.
Generally no, but in some contexts, it can feel a bit lonely or signify the end of a fun time. Mostly, it's just practical.
If the rain makes the sky look like night, you can say 天阴了 (the sky is overcast) instead.
The opposite would be 天亮了 (Tiān liàng le), which means 'It's getting light' or 'The sun is up.'
Related Phrases
天亮了
The sun is up / It's getting light.
不早了
It's not early (It's getting late).
天色已晚
The hour is late (formal).
该回家了
It's time to go home.
