是...的 (emphasis)

• Pinyin: shì...de
• Formation: Subject + 是 + [Emphasized Detail] + Verb + 的 + (Object)
• Hanzi breakdown: 是 = 日 (sun) + 疋 (foot/correct)

Meaning

The 是...的 (shì...de) construction is used to emphasize specific details about a past event that has already happened, such as the time, place, manner, or person involved.

The 是...的 pattern highlights background details of a known past action. The speaker and listener already know the action occurred — the point is to focus on when, where, how, or who. 是 is placed before the detail being emphasized, and 的 goes at the end of the sentence (or before the object in some cases). For example, 我是坐飞机来的 emphasizes the mode of travel. 是 can be omitted in casual speech, but 的 is essential. This pattern is different from the simple past with 了, which reports that something happened; 是...的 presupposes the event and zooms in on a specific aspect.

Examples

1. 我是去年搬到这个城市的。 It was last year that I moved to this city.
2. 她是坐地铁来上班的。 She comes to work by subway.
3. 这本书是在网上买的。 This book was bought online.

Usage Guide

Context: spoken, written, everyday

Tone: descriptive

Do Say

• 你是什么时候到的？
• 我是跟同事一起来的。
• 这件衣服是在北京买的。
• 他是自己开车去的机场。

Don't Say

• 我是明天去北京的。(是...的 emphasizes details of past events — it cannot be used for future actions that haven't happened yet) → 我明天去北京。
• 我是吃了饭的。(Do not combine 了 with 是...的 — they serve different purposes and conflict with each other) → 我是在食堂吃的饭。
• 她是很漂亮的。(是...的 is for emphasizing details of events, not for describing qualities — use 很 for adjectives) → 她很漂亮。

Origin & History

The 是...的 construction evolved from the copula 是 (to be) combined with the nominalizing particle 的. Together they create a cleft-like focus structure, similar to 'It was... that...' in English, allowing the speaker to foreground one detail of a past event.

Cultural Context

Generation: All ages

Social background: Universal