又…又…: both… and…
固定格式 / fixed patterns
Tone colorsā tone 1á tone 2ǎ tone 3à tone 4a neutral
Subject + 又 + Adj/V + 又 + Adj/V
又 A 又 B links two qualities or actions that are true at the same time: "both A and B".
Both items usually point the same way (two positives or two negatives): 又便宜又干净 (cheap and clean), 又累又饿 (tired and hungry).
With 又…又…, don't add 很 before the adjectives.
Examples
这个房间又大又干净。
Zhège fángjiān yòu dà yòu gānjìng.This room is both big and clean.
她做的菜又好看又好吃。
Tā zuò de cài yòu hǎokàn yòu hǎochī.Her dishes look good and taste good.
我今天又累又饿。
Wǒ jīntiān yòu lèi yòu è.I'm tired and hungry today.
孩子们又唱又跳，非常高兴。
Háizimen yòu chàng yòu tiào, fēicháng gāoxìng.The kids sing and dance, very happy.
Common mistakes
✗ 又很大又很干净 → ✓ 又大又干净.
Avoid mixing positive and negative: ✗ 又便宜又不好 sounds clumsy → say 虽然便宜，但是不好 instead.