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Using 正式 (zhèngshì) to express "formal" or "official"
Structure
正式 + Noun / Subject + 是 + 正式 + 的
Explanation
The adjective 正式 (zhèngshì) means "formal" or "official." It is used to describe things that follow established standards or protocols, such as formal events, official documents, or proper procedures. You can place 正式 before a noun as a modifier or use it as a predicate to describe something as legitimate and recognized.
Examples
这是一封正式的邀请函，请注意着装要求。
Zhè shì yì fēng zhèngshì de yāoqǐnghán, qǐng zhùyì zhuózhuāng yāoqiú.
This is a formal invitation — please pay attention to the dress code.
我们需要签一份正式的合同才能开始合作。
Wǒmen xūyào qiān yí fèn zhèngshì de hétong cáinéng kāishǐ hézuò.
We need to sign a formal contract before we can start the collaboration.
他穿了一套正式的西装去参加面试。
Tā chuān le yí tào zhèngshì de xīzhuāng qù cānjiā miànshì.
He wore a formal suit to the interview.