The 是...的 Construction in Chinese
是
The 是...的 construction spotlights one detail — when, where, how, or who — about an action both speakers already know happened. 是 opens the frame before that detail and 的 closes it after the verb. Use it to stress the detail, not to report that something happened for the first time.
Published July 8, 2026
Reviewed July 8, 2026
01 / PATTERN
See the Structure
MODEL
是 + time/place/manner + Verb + 的
Read the structure
The 是...的 construction spotlights one detail — when, where, how, or who — about an action both speakers already know happened. 是 opens the frame before that detail and 的 closes it after the verb. Use it to stress the detail, not to report that something happened for the first time. Keep the model 是 + time/place/manner + Verb + 的 visible while you compare each sentence.
我是昨天来的。
It was yesterday that I came.
Choose the right context
Stressing when a known past action happened: 我是昨天来的。 Stressing how or where it happened: 他是坐飞机来的 / 我是在北京学的中文。 Asking about the detail of a known event: 你是什么时候来的?
他是坐飞机来的。
He came by plane.
Respect the boundary
Reporting that something happened at all — that is 了's job: 我昨天买了一本书 announces the purchase; 是…的 assumes it is known and stresses a detail. Future or planned actions: 是…的 frames only a completed, established event. When you are not stressing when / where / how / who — with no such detail to highlight, use a plain sentence.
我是昨天来了。
(It was yesterday that I came.)
Repair the pattern
Ending the frame with 了 instead of 的: Once 是 opens the frame, the sentence must close with 的, not 了. 是…的 already marks the event as completed and known, so learners who swap in 了 out of habit break the pattern. Using 是 but dropping 的: The frame needs both halves: 是 opens it and 的 closes it after the verb phrase. With 是 present but no 的, the sentence sounds unfinished to a native ear.
我是昨天来的。
Use the repaired structure without changing the intended meaning.
02 / MAP
Read the Sentence
Read from left to right and notice the job performed by each part. The labels describe this example; they are not a rule that every Chinese sentence must copy.
我是昨天来的。
It was yesterday that I came.
我是
是
This part occupies the 是 position in the model pattern.
昨天
time/place/manner
This part occupies the time/place/manner position in the model pattern.
来
Verb
This part occupies the Verb position in the model pattern.
的
的
This part occupies the 的 position in the model pattern.
03 / EXAMPLES
Examples You Can Reuse
Keep the structure stable while changing the people, objects, times, or conditions. Pinyin is shown as reading support; use the Chinese sentence and translation to confirm the grammar relationship.
我是昨天来的。
It was yesterday that I came.
他是坐飞机来的。
He came by plane.
我是在北京学的中文。
I learned Chinese in Beijing.
你是什么时候来的?
When did you come?
这本书是他买的。
He's the one who bought this book.
04 / LIMITS
When to Use It — and When Not To
Use it when
- Stressing when a known past action happened: 我是昨天来的。
- Stressing how or where it happened: 他是坐飞机来的 / 我是在北京学的中文。
- Asking about the detail of a known event: 你是什么时候来的?
Do not use it when
- Reporting that something happened at all — that is 了's job: 我昨天买了一本书 announces the purchase; 是…的 assumes it is known and stresses a detail.
- Future or planned actions: 是…的 frames only a completed, established event.
- When you are not stressing when / where / how / who — with no such detail to highlight, use a plain sentence.
05 / REPAIR
Compare Right and Wrong
Compare the smallest meaningful change. Each explanation identifies a placement, scope, form, or clause relationship instead of treating the whole sentence as one undifferentiated mistake.
我是昨天来了。
我是昨天来的。
Ending the frame with 了 instead of 的
Once 是 opens the frame, the sentence must close with 的, not 了. 是…的 already marks the event as completed and known, so learners who swap in 了 out of habit break the pattern.
他是坐飞机来北京。
他是坐飞机来北京的。
Using 是 but dropping 的
The frame needs both halves: 是 opens it and 的 closes it after the verb phrase. With 是 present but no 的, the sentence sounds unfinished to a native ear.
我是昨天来了。
The 是…的 frame ends in 的, not 了: 我是昨天来的。
他是坐飞机来北京。
是 opened the frame, so it needs 的 to close it: 他是坐飞机来北京的。
我明天是坐飞机去的。
是…的 frames only a completed, known event; a future plan uses a plain sentence: 我明天坐飞机去。
06 / PRACTICE
Practice the Grammar Point
Complete three short tasks in order: judge the pattern, repair a common error, and build the sentence. Feedback is fixed and reviewed, so these activities do not use a checker allowance.
1. Judge the sentence
2. Choose the correction
3. Build the sentence
Build a complete sentence with 是.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 是. Your draft moves to the checker through this browser session, selects this grammar point as the first review focus, and waits for you to submit.
08 / QUESTIONS
The 是...的 Construction Questions
What is the difference between 是...的 and 了?
了 reports that something happened; 是…的 assumes everyone knows it happened and spotlights a detail — when, where, how, or who. 我买了书 tells you about the purchase, while 我是昨天买的 stresses that it was yesterday.
Can I drop 是 in a 是...的 sentence?
Often yes in positive statements: 我是昨天来的 and 我昨天来的 both work. But you can't drop 的, and in negative sentences 是 stays: 我不是昨天来的。
Where does 的 go when there is an object?
Usually right after the verb, before the object: 我是在北京学的中文. Putting it at the very end (学中文的) is also heard, but verb + 的 + object is the safe pattern.
09 / SOURCES
Sources and Review Notes
These references support different parts of the lesson. GF0025-2021 supports level placement only; professional grammar works support the explanation, limits, examples, and cross-checks. Their inclusion does not imply endorsement.
Modern Mandarin Chinese Grammar: A Practical Guide, 3rd ed.
Ross, Ma, Chen, He and Yeh · Routledge · 2024
Locator: Construction index and function chapters relevant to 是
Supports the learner-facing account of where 是 appears and what communicative job it performs.
Official sourceChinese: A Comprehensive Grammar, 2nd ed.
Yip and Rimmington · Routledge · 2016
Locator: Relevant sentence and clause chapters for 是
Cross-checks the 是 + time/place/manner + Verb + 的 pattern, clause relationship, and limits represented by the reviewed examples.
Official sourceChinese Proficiency Grading Standards for International Chinese Language Education (GF0025-2021)
Ministry of Education and State Language Commission · Ministry of Education of the PRC · 2021
Locator: Appendix A, Level 2 grammar inventory
Supports directory placement at HSK 2; it does not independently prove usage rules.
Official source10 / CONTINUE
Continue with a Connected Rule
Easy to confuse
的/得/地的 vs 得 vs 地 (the three de)
Final 的 in 是…的 has a constructional role unlike choosing among three de particles.
Easy to confuse
了了 (le): Completed Actions
Aspectual 了 and final 的 contribute different event and discourse meanings.
Learn first
是字句是 Sentences: Identification
Review ordinary copular 是 before contrasting its special constructional functions.
Easy to confuse
“是……的”句表看法或态度是……的 for Stance or Evaluation
Compare event focus with the stance-reinforcing use of the same visible frame.
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Easy to confuse
Final 的 in 是…的 has a constructional role unlike choosing among three de particles.