一来……二来 (firstly... secondly)

• Pinyin: yīlái...èrlái
• Formation: 一来 + Reason 1，二来 + Reason 2，(三来 + Reason 3)
• Hanzi breakdown: 一 = single horizontal stroke meaning 'one'; 来 = 木 (tree) with horizontal strokes suggesting arrival

Meaning

The structure 一来……二来 is used to list two or more reasons in sequence, presenting them as parallel justifications for a decision, opinion, or action. It provides an organized way to enumerate causes.

一来……二来 is a structured way to present multiple reasons, similar to 'for one thing... for another' in English. It is commonly used in spoken Chinese to explain a decision or justify an action by giving two complementary reasons. The structure can optionally extend to 三来 for a third reason, though this is less common. Unlike 首先……其次 which is more formal and suitable for presentations or essays, 一来……二来 feels more natural in everyday conversation and personal explanations. The reasons listed are typically of roughly equal weight, and together they build a stronger case than either alone.

Examples

1. 我不想去那家餐厅，一来太远，二来价格也不便宜。 I don't want to go to that restaurant — for one thing it's too far, and for another the prices aren't cheap.
2. 她决定辞职，一来工作压力太大，二来想多陪陪孩子。 She decided to resign — firstly the work pressure was too much, and secondly she wanted to spend more time with her children.
3. 一来天气不好，二来身体也不舒服，我就没出门。 For one thing the weather was bad, and for another I wasn't feeling well, so I didn't go out.

Usage Guide

Context: spoken, written, explanatory

Tone: reasoning

Do Say

• 一来我对这个行业比较熟悉，二来薪资待遇也不错，所以我接受了这份工作。
• 一来时间紧，二来人手不够，这个项目推迟了。
• 一来她性格随和，二来工作能力强，大家都喜欢跟她合作。

Don't Say

• 一来下雨了。(一来 introduces the first of multiple reasons — it requires at least a 二来 to complete the parallel structure) → 一来下雨了，二来路上堵车，所以我迟到了。
• 我一来了二来了去上班。(一来……二来 is for listing reasons, not sequential actions — use 先……然后 for sequential events) → 我先到了公司，然后开始上班。

Origin & History

来 in this construction functions as a discourse connector derived from its original meaning of 'coming' — each reason 'comes' in numbered sequence. This enumeration pattern mirrors classical Chinese list structures and has remained productive in modern spoken Mandarin.

Cultural Context

Generation: All ages

Social background: Universal