The 是...的 (shì...de) Construction
Emphasizing when, where, how, or who in past events
Category: Grammar
The Rule
是...的 (shì...de) is used to emphasize a specific detail (time, place, manner, or agent) of an already-known past action. The emphasis falls on the element placed between 是 and 的.
Why This Matters
English uses vocal stress for emphasis: 'I bought it YESTERDAY' vs 'I bought it at THE MALL'. Chinese can't rely on stress the same way, so it uses the 是...的 structure. The action itself is assumed known — the speaker is highlighting one specific detail about it. English speakers often confuse this with simple past tense, but 是...的 is about focus, not tense.
Examples
• 我是昨天来的。(Wǒ shì zuótiān lái de.) — "I came yesterday. (emphasis: when)" [是 before the time word 昨天 emphasizes WHEN] • 她是在北京出生的。(Tā shì zài Běijīng chūshēng de.) — "She was born in Beijing. (emphasis: where)" [是 before 在北京 emphasizes WHERE] • 你是怎么来的？(Nǐ shì zěnme lái de?) — "How did you get here? (emphasis: how)" [是 before 怎么 asks about the METHOD] • 这本书是谁写的？(Zhè běn shū shì shéi xiě de?) — "Who wrote this book? (emphasis: who)" [是 before 谁 asks about the AGENT]
Common Mistakes
❌ 我昨天来了。when you want to emphasize 'yesterday' ✅ 我是昨天来的。 → 了 simply states a completed action. 是...的 focuses the listener's attention on the emphasized element. 'I came yesterday' (neutral) vs 'It was YESTERDAY that I came' (emphatic). ❌ Placing 的 after the object: 我是在中国买的这本书 ✅ 我是在中国买这本书的。OR 这本书是在中国买的。 → In spoken Chinese, 的 often comes before the object: 我是在中国买的这本书 is actually acceptable colloquially, but the textbook form places 的 at the end. ❌ Using 是...的 for actions that haven't happened yet ✅ 是...的 is for past/completed events only → You can't say 我是明天来的 for a future action. 是...的 looks back at something that already happened.
Quick Tip
If you're asking/answering WHEN, WHERE, HOW, or WHO about a past event, reach for 是...的. It's the Chinese equivalent of English cleft sentences: 'It was... that...'
If you're asking/answering WHEN, WHERE, HOW, or WHO about a past event, reach for 是...的. It's the Chinese equivalent of English cleft sentences: 'It was... that...'
Examples
Common Mistakes
Incorrect: 我昨天来了。when you want to emphasize 'yesterday' → Correct: 我是昨天来的。. 了 simply states a completed action. 是...的 focuses the listener's attention on the emphasized element. 'I came yesterday' (neutral) vs 'It was YESTERDAY that I came' (emphatic).
Incorrect: Placing 的 after the object: 我是在中国买的这本书 → Correct: 我是在中国买这本书的。OR 这本书是在中国买的。. In spoken Chinese, 的 often comes before the object: 我是在中国买的这本书 is actually acceptable colloquially, but the textbook form places 的 at the end.
Incorrect: Using 是...的 for actions that haven't happened yet → Correct: 是...的 is for past/completed events only. You can't say 我是明天来的 for a future action. 是...的 looks back at something that already happened.
Quiz
What does 是...的 emphasize in '他是坐飞机来的'?