在
Pattern
Subject + 在 + verb phrase
Key words
Core idea
Progressive 在 marks an action as ongoing. It comes before the verb phrase and points to something unfolding over time.
It works naturally with actions like eating, waiting, reading, studying, or making a call.
Action boundary
If a place follows 在, you are probably seeing locative 在. If an action follows 在, you are probably seeing progressive 在. Context usually resolves the difference quickly.
Progressive 在 works with action verbs. It does not normally mark adjective-like state verbs or noun identities as “ongoing.”
For negation, do not treat this as a simple tense ending. Mandarin often uses 不是 to deny the whole ongoing-action claim, especially when correcting what someone thinks is happening.
Examples
我在吃饭。
Wǒ zài chīfàn.
I am eating.
在 before the verb marks the action as ongoing.
她在打电话。
Tā zài dǎ diànhuà.
She is making a phone call.
他们在等公车。
Tāmen zài děng gōngchē.
They are waiting for the bus.
Common mistakes
Avoid
我吃饭在。
Use
我在吃饭。
Progressive 在 comes before the verb phrase.
Avoid
我在是学生。
Use
我是学生。
在 marks ongoing actions, not noun identities.
Seen in stories
The Morning Ferry
八点半，他们还在早餐店买水。
At eight thirty, they are still buying water at the breakfast shop.
The LINE Call at the Gate
阿哲指着耳机，说：“我在打LINE，不是在叫你。”
Azhe points at his earphones and says, “I am calling on LINE, not calling you.”
The LINE Call at the Gate
小晴看看橘猫，问：“那它在听吗？”
Xiaoqing looks at the orange cat and asks, “Then is it listening?”
Who Are You?
他说：“对不起，我在打电话，不是和你说话。”
He says, "Sorry, I am making a phone call, not talking to you."