换 + Object; A 换 B
换 (huàn) means "to change," "to exchange," or "to swap." It is used when replacing one thing with another or trading items. Common usages include 换衣服 (to change clothes), 换钱 (to exchange money), and 换工作 (to change jobs). It takes a direct object indicating what is being changed.
天太热了,我想回家换件衣服。
tiān tài rè le, wǒ xiǎng huí jiā huàn jiàn yīfu.
It's too hot; I want to go home and change my clothes.
你能帮我换一下零钱吗?
nǐ néng bāng wǒ huàn yíxià língqián ma?
Can you help me break this into small change?
他最近换了一份新工作,收入高了不少。
tā zuìjìn huànle yí fèn xīn gōngzuò, shōurù gāole bù shǎo.
He recently switched to a new job, and his income has increased quite a bit.