HSK 1
在 / 正在: Ongoing Actions in Chinese
在 and 正在 mark an action in progress — what someone is doing right now. 在 is the everyday form; 正在 stresses that it is happening at this very moment, and 呢 often closes the sentence for a softer tone. This progressive is a moving action, unlike 着, which marks a lasting state.
STRUCTURE
Subject + (正)在 + Verb + Object (+ 呢)
When to use 在 — and when not
Use it when
- Saying what is happening now: 我在吃饭 / 他正在睡觉。
- Answering "what are you doing?": 你在做什么? — 我在看书。
- Adding 呢 for a natural, softer tone: 我在工作呢。
Don't use it when
- A lasting state or posture — that is 着: 门开着 (the door is open), not 门在开。
- Habitual or completed actions — 每天 routines and finished events don't use 在: 我每天跑步 / 我吃了饭。
- Adjective conditions: 在 marks actions, not states — 我很累, not 我在累。
Right vs. wrong
我吃饭在。
我在吃饭。
在 placed after the verb
在 is a pre-verb marker for the progressive, so it stands before the verb: 在吃饭. Placing it after the verb phrase is ungrammatical.
灯在开。
灯开着。
Using 在 for a state that needs 着
A light that stays on is a lasting state, not an action in progress. Continuous states take verb + 着 (开着), while 在 would mean someone is in the act of switching it on.
Examples
我在吃饭。
Wǒ zài chī fàn.
I'm eating.
他正在睡觉。
Tā zhèngzài shuìjiào.
He is sleeping right now.
你在做什么?
Nǐ zài zuò shénme?
What are you doing?
我在看书呢。
Wǒ zài kàn shū ne.
I'm reading.
孩子们正在教室里学习。
Háizimen zhèngzài jiàoshì lǐ xuéxí.
The children are studying in the classroom.
Common mistakes
我吃饭在。
Wǒ chī fàn zài.
在 comes before the verb: 我在吃饭。
灯在开。
Dēng zài kāi.
A light staying on is a state, so use 着: 灯开着。
我每天在跑步。
Wǒ měitiān zài pǎobù.
Habitual actions don't take progressive 在; drop it: 我每天跑步。
Think you've got it?
Write your own 在 sentence and check that grammar point first.
在 / 正在: Ongoing Actions FAQ
What is the difference between 在 and 正在?
Both mark an action in progress. 在 is the everyday form (我在吃饭); 正在 emphasizes "right at this moment" (我正在吃饭呢). In speech you'll use 在 most of the time.
What is the difference between 在 and 着?
在 marks a moving action happening now (我在开门 — I'm opening the door). 着 marks a resulting state that lasts (门开着 — the door is open). One is the action, the other the state it leaves.
Do I need 呢 at the end?
No, it's optional. 我在工作 and 我在工作呢 both mean "I'm working"; 呢 just makes it sound softer and more conversational.