English has a cleft sentence for exactly this job: "It was last year that he got married," "It was in Beijing that I studied Chinese." You take a fact everyone accepts — he got married, you studied Chinese — and you spotlight one detail of it. Mandarin does the very same thing with a frame you clamp around the sentence: 是 … 的 (shì … de). The event between the brackets is treated as old news; the piece you drop inside the frame is the answer to a silent "when / where / how / by whom, exactly?" This page is about choosing what to put in that spotlight. The frame itself, and when to reach for it at all, is covered on the 是…的 construction hub.
The event is old news; the circumstance is the point
是…的 only makes sense when the action is already established as having happened — usually a completed, past event. Nobody is disputing that he got married or that you studied Chinese. What is up for grabs is a circumstance of that event, and that circumstance is what sits between 是 and 的.
The four things people most often want to pin down are time, place, manner, and agent. Each just slides into the same frame.
| Focus | Example | The silent question it answers |
|---|---|---|
| Time | 他是去年结婚的 | When did he get married? |
| Place | 我是在北京学的中文 | Where did you study Chinese? |
| Manner | 她是走着来的 | How did she come? |
| Agent | 这本书是我写的 | Who wrote this book? |
TIME — when, exactly
Put the time expression right after 是. The listener already knows the event occurred; you are settling when.
他是去年结婚的，我们都去喝喜酒了。
tā shì qùnián jiéhūn de, wǒmen dōu qù hē xǐjiǔ le
He got married last year — we all went to the wedding banquet. (informal) — 去年 sits in the spotlight; nobody doubts he married.
你是什么时候到的？我怎么没看见你。
nǐ shì shénme shíhou dào de? wǒ zěnme méi kànjiàn nǐ
When exactly did you arrive? How come I didn't see you? (informal) — the question word 什么时候 goes inside the frame.
Because the frame answers "when," it pairs naturally with the question words 什么时候 (shénme shíhou, when) and 几点 (jǐ diǎn, what time). A bare 你到了吗 asks whether you arrived; 你是什么时候到的 assumes you did and asks when.
PLACE — where, exactly
The place phrase — normally a 在 (zài) location — goes after 是.
我是在北京学的中文，所以口音有点儿北方味儿。
wǒ shì zài Běijīng xué de Zhōngwén, suǒyǐ kǒuyīn yǒudiǎnr běifāng wèir
I studied Chinese in Beijing, so my accent has a bit of a northern flavor. (informal) — 在北京 is the focus.
这条裙子是在网上买的，比店里便宜多了。
zhè tiáo qúnzi shì zài wǎngshàng mǎi de, bǐ diàn li piányi duō le
I bought this skirt online — way cheaper than in the shop. (informal) — 在网上 answers 'where'.
MANNER — how, exactly
Manner covers means of transport, instruments, and the way an action was done. It slots in after 是 just the same.
她是走着来的，难怪出了一身汗。
tā shì zǒu zhe lái de, nánguài chū le yì shēn hàn
She came on foot — no wonder she's all sweaty. (informal) — the durative 走着 describes how she came.
我们是坐高铁去的，两个小时就到了。
wǒmen shì zuò gāotiě qù de, liǎng ge xiǎoshí jiù dào le
We went by high-speed rail — it only took two hours. (neutral) — 坐高铁 is the manner in focus.
AGENT — who, exactly
To spotlight who did it, put the doer between 是 and 的. This is the closest Mandarin comes to English "It was I who wrote it."
这本书是我写的，你觉得怎么样？
zhè běn shū shì wǒ xiě de, nǐ juéde zěnmeyàng?
I'm the one who wrote this book — what do you think? (informal) — 我 is the agent in focus.
这道菜是我妈做的，味道特别正宗。
zhè dào cài shì wǒ mā zuò de, wèidào tèbié zhèngzōng
This dish was made by my mom — it tastes really authentic. (informal) — the doer 我妈 answers 'who'.
Dropping 是 in the affirmative
In a positive sentence, the 是 is optional — speakers drop it constantly, and the 的 alone still carries the whole construction.
我在北京学的中文。
wǒ zài Běijīng xué de Zhōngwén
I studied Chinese in Beijing. (informal) — 是 dropped; the 的 still marks the frame.
他去年结婚的，你不知道吗？
tā qùnián jiéhūn de, nǐ bù zhīdào ma?
He got married last year — you didn't know? (informal) — bare 的, no 是, fully idiomatic.
Common Mistakes
1. Leaving the intended focus outside the frame. The whole point of 是…的 is that the highlighted element sits between 是 and 的. Park it outside, and the emphasis evaporates.
❌ 我是学的中文在北京。
Incorrect — 在北京 has spilled out past 的, so nothing is in focus.
✅ 我是在北京学的中文。
wǒ shì zài Běijīng xué de Zhōngwén
It was in Beijing that I studied Chinese. — 在北京 sits inside the frame.
2. Using 是…的 for an event that isn't established. If you are announcing that something happened for the first time, you want plain 了, not 是…的.
❌ 我是买了一个新手机的。
Incorrect for breaking news — this frames a settled event, but you're announcing it fresh.
✅ 我买了一个新手机。
wǒ mǎi le yí ge xīn shǒujī
I bought a new phone. — plain 了 announces the event itself.
3. Adding 了 inside the 是…的 frame. The construction already presupposes completion, so a redundant 了 on the verb is wrong.
❌ 他是去年结婚了的。
Incorrect — 是…的 already implies it happened; drop the 了.
✅ 他是去年结婚的。
tā shì qùnián jiéhūn de
He got married last year. — no 了; 是…的 carries the completion.
4. Answering a 是…的 question with a bare fact. If someone asks 你是怎么来的, they already know you came — echo the frame in your answer.
❌ 我坐地铁。
Under-answers 你是怎么来的 — it sounds like a habit or a plan, not a report of how you came.
✅ 我是坐地铁来的。
wǒ shì zuò dìtiě lái de
I came by subway. — echoes the 是…的 frame the question set up.
Key Takeaways
- 是…的 highlights one circumstance of an event everyone already treats as having happened — it is a spotlight, not a tense.
- Slot the element you want to stress between 是 and 的: TIME (是去年…的), PLACE (是在北京…的), MANNER (是走着…的), or AGENT (是我…的).
- The frame answers a silent when / where / how / by whom, so it pairs with question words like 什么时候 and 怎么.
- In the affirmative, 是 is optional (我在北京学的中文); the 的 alone holds the construction together.
- Do not add 了 to the verb inside the frame — 是…的 already presupposes the action is done.
Now practice Chinese
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Chinese→Related Topics
- The 是…的 Construction (Overview)HSK 3 — The 是…的 (shì…de) construction spotlights the CIRCUMSTANCES of a completed, known event — the time, place, manner, means, or agent. 我是坐飞机来的 'it was by plane that I came', 他是昨天到的 'it was yesterday that he arrived'. The frame is Subject + 是 + [circumstance] + Verb + 的. It's Chinese's version of English clefting — 'It was X that…' — and it works only for realized, past events, never future ones.
- Object Placement in 是…的HSK 4 — When the verb inside a 是…的 sentence takes an object, the 的 can land either before it (我是在食堂吃的饭) or after it (我是在食堂吃饭的) — both are correct. The spoken default drops 的 right after the verb, with the object trailing; a pronoun object, though, forces 的 to the very end.
- Negating 是…的 (不是…的)HSK 4 — To negate a 是…的 sentence you wrap it in 不是…的, and here the 是 can never be dropped: 我不是坐飞机来的，是坐火车来的 'I didn't come by plane, I came by train'. The negation denies the CIRCUMSTANCE while conceding the event happened — the opposite of 没, which denies the event itself.
- Question Words Stay In Place (In Situ)HSK 1 — The single most important rule for Chinese wh-questions: the question word sits exactly where the answer will sit. No fronting, no do-support, no reordering — 你去哪儿？ not ❌哪儿你去？ And because the question word already asks, you never add 吗.