为 + Object/Goal + Verb Phrase
The preposition 为 (wèi) means 'for' or 'for the sake of' and is used to indicate purpose or benefit. It introduces the reason, goal, or beneficiary of an action. For example, 为竞争 means 'for the purpose of competing.'
他为家人放弃了出国的机会。
Tā wèi jiārén fàngqì le chūguó de jīhuì.
He gave up the opportunity to go abroad for his family.
我们为提高效率做了很多改进。
Wǒmen wèi tígāo xiàolǜ zuò le hěn duō gǎijìn.
We made many improvements to increase efficiency.
她为这次比赛准备了好几个月。
Tā wèi zhè cì bǐsài zhǔnbèi le hǎo jǐ ge yuè.
She prepared for this competition for several months.