非 (fēi)

In Chinese, "非" is an adverb or conjunction that indicates negation or denial. It is often used to express negation or contradiction. Below are detailed usages of "非".

1. As an Adverb

As an adverb, "非" negates the action or state expressed by the verb, indicating that something is not the case or is not true. For example:

• 他非常高兴。 (Tā fēicháng gāoxìng.) — He is extremely happy. (lit. He is extremely happy.)
• 这件事非常重要。 (Zhè jiàn shì fēicháng zhòngyào.) — This matter is extremely important. (lit. This matter is extremely important.)

2. As a Conjunction

As a conjunction, "非" introduces a negative clause or statement, expressing contradiction or denial. For example:

• 他不是老师，而是医生。 (Tā bùshì lǎoshī, érshì yīshēng.) — He is not a teacher, but a doctor. (lit. He is not a teacher, but a doctor.)
• 这不是我的书，是他的。 (Zhè bùshì wǒ de shū, shì tā de.) — This is not my book, it's his. (lit. This is not my book, it's his.)