成心

tā chéng xīn huài shì

他成心坏事。

He intentionally makes a mess.

tā bù shì chéng xīn ràng nǐ nán kān

他不是成心让你难堪。

He didn't mean to embarrass you.

wǒ bù shi chéng xīn de

我不是成心的。

I didn't do it on purpose.