一、用作动词，意为“与……有关；涉及”。如：
Don’t interfere in what doesn’t concern you.别管与自己无关的事。
① 意为“焦虑；担心”。如：
There is growing concern that they may have been killed. 越来越担心他们可能已遭杀害。
② 意为“对某人来说最关心或最感兴趣的事”。如：
What’s your main concerns as a writer? 身为作家，你对什么最感兴趣？
① concern oneself with / in / about sth. “忙于某事 / 关心某事 / 参与某事”。如：
She concerns herself with social welfare. 她从事社会福利工作。
② as / so far as sb. / sth. be concerned“就某人 / 某物而言”。如：
As far as I’m concerned, I don’t object to your decision. 就我（个人）而言，我不反对你的决定。
③ be concerned in / with sth. “与某物有牵连”。如：
He was concerned with the crime. 他与那起罪案有关。
④ be concerned to do sth.“把做某事视为自己的事情”。如：
He is always concerned to help others.他总是把帮助别人看作是自己的事情。
⑤ show / express concern about / for “对……表示关心、担心”。如：
She showed a great deal of concern for her son’s illness. 她非常担心她儿子的病情。
⑥ have a concern in / with... “与……有利害关系”。如：
I have no concern with that company.我与那家公司没什么关系。
⑦ be concerned about... / that... “关心……；担心……”。如：
I’m concerned that they may have got lost. 我担心他们可能迷路了。
① concerned形容词，意为“有关的；担心的”。如：
Concerned parents held a meeting. 忧心忡忡的家长们开了一次会。
② concerning介词，意为“关于；有关”。如：
Concerning his proposal, there are pros and cons. 关于他的提案，有赞成和反对两种意见。
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