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Using 不是 (bùshì) to express "is not"
Negation
Structure
Subject + 不是 + Noun/Adjective
Explanation
不是 (bùshì) means "is not" and is the negation of the verb 是 (shì, to be). It is used to deny identity, classification, or truth, and can also add emphasis when placed before other verbs to mean "not really" or "not actually."
Examples
他不是我们班的学生。
Tā bú shì wǒmen bān de xuéshēng.
He is not a student in our class.
这不是我点的菜，你拿错了。
Zhè bú shì wǒ diǎn de cài, nǐ ná cuò le.
This is not the dish I ordered; you brought the wrong one.
今天不是周末，图书馆应该开门。
Jīntiān bú shì zhōumò, túshūguǎn yīnggāi kāimén.
Today is not the weekend, so the library should be open.