为 + Purpose/Goal + Verb Phrase
为 (wèi) is a preposition meaning 'for' or 'in order to,' used to express purpose or the beneficiary of an action. It is placed before the goal or purpose phrase. For example, 为实现他的承诺 means 'in order to fulfill his promise.'
他为了家人一直努力工作。
tā wèile jiārén yīzhí nǔlì gōngzuò.
He has been working hard for the sake of his family.
我们为这次比赛准备了很久。
wǒmen wèi zhè cì bǐsài zhǔnbèi le hěn jiǔ.
We prepared for this competition for a long time.
她为实现梦想付出了很多。
tā wèi shíxiàn mèngxiǎng fùchū le hěn duō.
She has given a lot to achieve her dream.