保证 + Clause/Noun
The word 保证 (bǎozhèng) means "guarantee" or "to ensure" and can function as both a noun and a verb. It is used when talking about assuring a certain outcome or making a promise that something will be maintained or achieved.
我保证按时完成这个项目。
Wǒ bǎozhèng ànshí wánchéng zhège xiàngmù.
I guarantee I will finish this project on time.
质量是我们对客户最基本的保证。
Zhìliàng shì wǒmen duì kèhù zuì jīběn de bǎozhèng.
Quality is our most basic guarantee to our clients.
谁也无法保证明天会发生什么。
Shéi yě wúfǎ bǎozhèng míngtiān huì fāshēng shénme.
No one can guarantee what will happen tomorrow.