一边 … 一边 …: doing two things at once
【一39】并列复句 (一边……，一边……)
Tone colorsā tone 1á tone 2ǎ tone 3à tone 4a neutral
Subject + 一边 + V1，一边 + V2
一边…一边… (yìbiān… yìbiān…) expresses two simultaneous actions, like “while…-ing”: 他一边走路，一边唱歌 (he sings as he walks).
The subject appears only once, at the start. Each 一边 is followed by a verb.
It's an easy way to build a two-clause sentence at level 1. Two other ways to coordinate: simply juxtapose (我喜欢看电视，弟弟喜欢打球) or use 也 (这个房间很大，也很干净).
Examples
他一边走路，一边唱歌。
Tā yìbiān zǒulù, yìbiān chàng gē.He sings while walking.
哥哥一边看电视，一边吃东西。
Gēge yìbiān kàn diànshì, yìbiān chī dōngxi.My older brother eats while watching TV.
我们一边吃饭，一边说话吧。
Wǒmen yìbiān chī fàn, yìbiān shuōhuà ba.Let's talk while we eat.
我喜欢看电视，弟弟喜欢打球。
Wǒ xǐhuan kàn diànshì, dìdi xǐhuan dǎ qiú.I like watching TV; my younger brother likes ball games.
Common mistakes
✗ 他一边走路，他一边唱歌 → ✓ 他一边走路，一边唱歌 (subject only once).
✗ 一边他走路 → ✓ 他一边走路.
Tone: 一边 is read yìbiān.