Subject + 在 + Verb
Reach for 在 + Verb when you want to say something is happening right now — 'I'm watching TV,' 'they're singing,' 'the cat is sleeping.' It's the most common way to mark an ongoing action in Mandarin, equivalent to English '-ing' in the present continuous. Drop 在 directly before the verb; no other tense markers needed. You can strengthen it with 正在 for 'right at this moment' or soften it by ending the sentence with 呢, but the bare 在 + Verb is the everyday default for beginners.
Structure
[SUBJECT] 在 [VERB] ([OBJECT])
zài [VERB]...
How to Think About It
在 here is a time-marker, not the location word 'at.' It freezes the camera on the verb and says 'this is happening now.' Don't confuse it with the location 在 (我在家 = I'm at home), which sits between subject and a place noun. With a verb after it, 在 always means 'in the middle of doing.' Negate with 没在 (没在看 = not currently watching), not 不在.
Examples
我在看书。
Wǒ zài kàn shū.
I'm reading a book.
他们在打篮球。
Tāmen zài dǎ lánqiú.
They're playing basketball.
妈妈在做饭。
Māma zài zuò fàn.
Mom is cooking.
Common Mistake
Learners pile 了 onto a 在 + Verb sentence ('我在看了电视'), trying to mark completion. 在 + Verb signals an ongoing action, which is incompatible with 了 (the completion marker). Pick one or the other depending on whether the action is in progress or already done.
我在看了电视。
我在看电视。
Don't Confuse With
正在 + Verb
Use 正在 to stress 'right at this very moment.' Plain 在 is enough for any ongoing action; 正在 just adds urgency.
Verb + 着
Use 着 for a sustained STATE (门开着 = the door is open). 在 + Verb is for an ACTION in motion. 'Door is open' vs 'someone is opening the door.'
在 + Place
Use 在 + place noun (我在家) to say WHERE someone is. 在 + verb says WHAT they're doing right now. Same character, different jobs depending on what follows.
Practice
Fill in the blank: 弟弟 ___ 写作业。
Show answer
在
Fill in the blank: 我们在 ___ 电影。 (watching)
Show answer
看
Arrange: 在 / 老师 / 课文 / 读
Show answer
老师在读课文。
Translate: The children are singing.
Show answer
孩子们在唱歌。
Write one sentence about what you're doing right now using 在.
Show answer
我在学中文。
Hear It in Real Episodes
This pattern appears in 3 Fluentide episodes. Press play to hear the sentence:
我们在看电视。
We're watching TV.
Unitree Robots Star in CCTV Spring Festival GalaBeginner
“一只猫在跳舞。”
"A cat is dancing." [needs translation: ”]
ByteDance Seedance AI Sparks Video RaceElementary
Related Grammar Patterns
Acquire by listening
Hear Subject + 在 + Verb in real Chinese, not in a textbook.
Fluentide picks the next news episode at your level, so this pattern shows up again and again in real context. The transcript marks it, the audio drills it. Free to start.