一 + MW + 一 + MW (one by one)

• Pinyin: yī
• Formation: 一 + Measure Word + 一 + Measure Word + (地) + Verb

Meaning

The pattern 一 + measure word + 一 + measure word creates an adverbial phrase meaning 'one by one' or 'piece by piece,' emphasizing that an action happens individually or sequentially. It is followed by 地 before the verb.

This reduplication pattern adds a vivid, deliberate quality to actions, suggesting care, thoroughness, or a slow pace. The measure word must match the noun being described — 一本一本 for books, 一个一个 for people or general items, 一片一片 for flat objects like leaves. The particle 地 typically follows the reduplicated phrase to connect it to the verb as an adverb. This pattern can also be used without a following verb as a predicate complement. It is more common in narrative and descriptive writing than in casual conversation, where simpler expressions like 一个个 might be preferred.

Examples

1. 老师把作业一本一本地检查。 The teacher checked the homework one by one.
2. 孩子们一个一个地走进了教室。 The children walked into the classroom one by one.
3. 她一页一页地翻看那本旧相册。 She flipped through the old photo album page by page.

Usage Guide

Context: spoken, written, descriptive

Tone: descriptive

Do Say

• 请大家一排一排地离开会场。
• 他一口一口地喝完了那碗汤。
• 星星一颗一颗地在夜空中出现了。

Don't Say

• 学生们一一个地站起来了。(The measure word must repeat after each 一 — say 一个一个, not 一一个) → 学生们一个一个地站起来了。
• 她把苹果一个地一个放进了袋子里。(地 goes after the entire 一MW一MW phrase, not in the middle — say 一个一个地) → 她把苹果一个一个地放进了袋子里。

Origin & History

This reduplication pattern with measure words creates a vivid sense of sequential or individual action. It is related to the broader Chinese grammatical tendency to use reduplication for emphasis, distribution, and creating a sense of thoroughness.

Cultural Context

Generation: All ages

Social background: Universal