wèi 为 for

for

Wǒ zhēn wèi nǐ gāo-xìng！
我真为你高兴！
I am really happy for you!

for

Tā zài wèi hái-zi chàng cuī-mián-qǔ.
她在为孩子唱催眠曲。
She is singing lullabies to the children.