1
do sth on purpose
She broke the vase on purpose.
她故意打破了花瓶。
故意；有意
先理解核心含义，再看它在真实句子里的用法。
故意；有意
with intention; in an intentional manner
She broke the vase on purpose.
她故意打破了花瓶。
故意地；有目的地
with intention; in an intentional manner
She spilled her drink on purpose to get attention.
她故意把饮料洒了以引起注意。
I think he left the door unlocked on purpose.
我认为他故意没锁门。
They chose the smallest room on purpose to save money.
他们故意选了最小的房间以省钱。
She broke the vase on purpose.
她故意打破了花瓶。
用于强调某行为是故意的。
It was not an accident; it was on purpose.
那不是意外，是故意的。
He left early on purpose to avoid the traffic.
他故意早离开以避开交通拥堵。
Not this
He did it by purpose.
Use this
He did it on purpose.
“by purpose”是中文“故意”的直译，英语中固定短语是“on purpose”，表示“故意地”。
Not this
That was an on purpose action.
Use this
That was an action on purpose.
“on purpose”是副词短语，不能用作形容词修饰名词；应放在动词后或句末作状语。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use on purpose naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
常置于动词后或句末，表示行为是有意的。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Dictionary facts from ECDICT.