1
expend sth on sth
expend 比 spend 正式，常搭配 time、effort、money、resources 等。
They expended a lot of effort on the project.
他们在那个项目上花费了大量精力。
花费；消耗；用尽
expended — past of expend
先理解核心含义，再看它在真实句子里的用法。
花费；消耗；用尽
to spend or use energy, time, money, etc.
They expended a lot of effort on the project.
他们在那个项目上花费了大量精力。
消耗,耗尽(某种资源)。
To consume, exhaust (some resource).
expend
Base
原形
expends
3rd person
第三人称单数
expending
-ing
现在分词
expended
Past
过去式
expended
Past participle
过去分词
We expend energy every day.
我们每天都消耗精力。
They expended all their resources last year.
他们去年耗尽了所有资源。
She has expended a lot of time on this project.
她在这个项目上已经花费了大量时间。
expend 是正式动词，指消耗或花费时间、精力、金钱等。
The project will expend a large amount of energy before it is finished.
这个项目在完成之前将消耗大量能源。
We expended most of our savings on the repairs.
我们把大部分积蓄都花在了修理上。
The team is expending too much time on this small detail.
团队正在这个小细节上花费太多时间。
expend 比 spend 正式，常搭配 time、effort、money、resources 等。
They expended a lot of effort on the project.
他们在那个项目上花费了大量精力。
in doing sth 强调动作过程；该结构多用于书面语。
She expended considerable energy in preparing the report.
她在准备这份报告时耗费了大量精力。
Not this
I expended my pocket money on snacks.
Use this
I spent my pocket money on snacks.
expend 是正式书面词，常用于消耗精力、资源等；日常花钱或时间更常用 spend，这样表达更自然，意思不变。
Not this
The expend of energy on this project was huge.
Use this
The expenditure of energy on this project was huge.
expend 是动词，不能直接作名词表示“消耗”；这里需要名词 expenditure（或 expense）。把 expend 改为 expenditure 后句子成分才正确。
Not this
They expended a lot of effort for solving the problem.
Use this
They expended a lot of effort in solving the problem.
expend 与 effort 搭配时，表示“在某事上耗费”应用介词 in 或 on，而不用 for；in solving 表示在解决问题的过程中耗费，搭配才正确。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
消耗能量
Runners expend a lot of energy during a marathon.
马拉松选手在比赛中消耗大量能量。
付出努力
She expended considerable effort on the project.
她在这个项目上付出了大量努力。
耗费资源
The company expended its resources on new equipment.
公司把资源都花在了新设备上。
花费时间
Don't expend too much time on minor details.
不要在琐碎的细节上花费太多时间。
花费金钱
They expended all their money on the trip.
他们把所有的钱都花在了这次旅行上。
消耗卡路里
Swimming expends more calories than walking.
游泳比步行消耗更多卡路里。
Use expended naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 spend 的 s 换成 ex（向外），钱花出去了，就是 expend“花费、消耗”。
语域：formal 常见场景：formal writing、academic texts、official documents expend 多用于正式或书面语，表示消耗资源、精力、时间等，语气比 spend 更正式；日常口语中通常更常用 spend。
这些词都以 /-end/ 结尾，与 expend 的重读部分 /spend/ 押韵。注意 expand /ɪkˈspænd/ 拼写相似但不押韵，其元音是 /æ/。
Dictionary facts from ECDICT, WIKTIONARY.