Concernn.关系、关心、关心的事、忧虑。只有在指忧虑、担心、关切时不可数，为抽象名词，其它情况可数！例句：In her last days the poet expressed concern for her father.在生命最后的日子里，诗人表达了她对父亲的关切。One of the concerns that people have is the side effects of treatment.人们担心的问题之一是治疗的副作用。
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。
二、用作名词。
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？
三、常用搭配：
①concern oneself with / in /about sth.“忙于某事/关心某事/参与某事”。
②as/so far as sb./sth. be concerned“就某人/某物而言”。
③be concerned in/ with sth.“与某物有牵连”。
④be concerned to do sth.“把做某事视为自己的事情”。
⑤show / express concern about/for“对……表示关心、担心”。
⑥have a concern in/with...“与……有利害关系”。
⑦be concerned about.../that...“关心……；担心……”。
四、同根词：
①concerned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。
②concerning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。
1.Issues such as these were not really his concern.
他其实并不关心诸如此类的问题。
2.A good relationship involves concern and sensitivity for each other's feelings.
一段美满的恋情需要彼此关心并体恤对方的情感。