既 (jì) can be used in conjunction with either 又 (yòu) or 也 (yě) to express that something is "both A and B":
Used with 又
Structure
A and B can be adjectives, verbs or short phrases. Most of the time A and B will take the same form i.e. if A is an adjective B will also be an adjective.
Examples
- 他 做 事情 既 快 又 好。 He does things both quickly and well.
- 这 家 银行 的 服务既 热情 又周到。 This bank's service is both enthusiastic and thorough.
- 这个 产品 的 设计 既 时尚 又 人性化。 This product's design is both stylish and humane.
Used with 也
Structure
The structure can also be formed with 也, but here it is used primarily for verbs or verb phrases:
既 + [Verb Phrase] ，也 + [Verb Phrase]
Examples
- 她 既 是 我 妈妈 ，也 是 我 朋友。 She is both my mother and my friend.
- 要求 是 你 既 要 会 说 流利 的 中文 ，也 要 会 说 流利 的 英文 。 The requirement is that you need to speak both fluent Chinese and English.
- 爸爸 很 生 气 我 的 气 ，不过 他 既 没 打 我 ，也 没 骂 我 。 My father was really mad at me, but he neither hit me nor scold me.
See also
Sources and further reading
Books
- New Practical Chinese Reader 3 (新实用汉语课本3) (pp. 120)