care

Compared meaning: feel worried (verb).

比较义项：担心（动词）。

• worry

  Worry directly names the feeling of anxiety and is used freely in positive statements, questions and negatives (worry about, worry that, don't worry); it can also be transitive, meaning to make someone else anxious.

  worry 直接表达“焦虑、担心”这种感觉，可以自由用于肯定句、疑问句和否定句（worry about、worry that、don't worry）；它还可以带宾语，表示“让某人担心”。

  Please don't worry about the interview — you're well prepared.

  别担心面试了——你已经准备得很充分了。

• care 本词

  Care in this sense mainly appears in negative or question forms (don't care, who cares, couldn't care less) meaning something causes no worry at all; in a plain positive statement it usually shifts to meaning 'value' rather than 'feel anxious'.

  care 在这个意义上主要出现在否定句或疑问句中（don't care、who cares、couldn't care less），表示某件事完全不会让人担心；而在普通肯定句里，care 通常变成“在乎、重视”的意思，而不是“感到焦虑”。

  I honestly don't care whether it rains on the day of the picnic.

  说实话，野餐那天下不下雨，我一点也不担心。

Worry and care can both relate to feeling anxious, but they behave differently. Worry names the feeling, used freely in statements and questions. Care appears mainly in negative or question forms, like 'don't care', meaning nothing causes worry; in a positive sentence, care means 'value'.

这两个词在这个意义上都能对应“担心”，但语气和常见句型不同：worry 直接表达“感到焦虑、担心”，可以自由用在肯定句、疑问句里；care 在这个意义上主要出现在否定句或疑问句中（don't care、who cares），表示“不放在心上、不担心”，而在普通肯定句里 care 通常变成“在乎、重视”的意思，不再是“担心”。这里不比较 care 的“照顾”义项（如 take care of your little sister）。

Compared meaning: a feeling of worry (noun).

比较义项：忧虑、担心（名词）。

• care 本词

  In this sense 'care' is literary and mainly survives in fixed idioms like 'without a care in the world', unlike 'concern', which freely combines with 'about' to name a specific worry.

  在这个意义上，care偏书面语，主要保留在“无忧无虑”（without a care in the world）这类固定说法里；而concern可以自由地与about连用来指具体的担忧对象。

  She backpacked through Europe without a care in the world.

  她无忧无虑地背包旅行穿越欧洲。

• concern

  'Concern' is the everyday, neutral word for worry about a specific issue, often used with 'about' or as 'main/biggest concern'.

  concern是表示对某个具体问题感到担心的日常中性词，常与about连用，或用作main concern（主要担忧）之类的说法。

  His biggest concern is losing his job before retirement.

  他最大的担忧是在退休前失业。

Care and concern can both mean a feeling of worry. Care is literary here, mostly in the phrase without a care in the world. Concern is the everyday, neutral word for worry about a specific issue. Care meaning to look after someone is not compared.

这两个词在“忧虑”这一意义上比较接近，但语气和用法不同：concern是日常、中性的词，常与about连用以指具体的担忧对象；care在这一意义上更书面、偏文学化，主要保留在without a care in the world这类固定说法里。这里不比较care表示“照顾、照料”的用法（如take care of）。