concerned，concerning这两个词的词义并不相同，用法亦有异。
Concerned是分词形容词，其意为“有关的”（involved）；
concerning是由分词转换而成的介词，其意为“关于”（relating to）。请看下面的例句：
This agreement will be signed by the parties
concerned．此协议将由各有关方面签署。
They called on all departments concerned to take prompt steps
to promote the development of light
industry． 他们要求各有关部门迅速采取措施，促进轻工业发展。
由例句可见，concerned用作形容词解作“有关的”时，是后置定语，大都放在它所修饰的名词之后。但在动词“to
be”之后而同样解作“关于”时，则要用be concerned with的形式，如：
This book is concerned with English usage． 此书是与英语惯用法有关。
值得注意的是，concerned（亦可表示动词之意）也可解作“关心”、“担心”、“挂…念的，担…心”的解，与之搭配的介词为at、about或，用作此意时，concerned也是形容词。例：
He was deeply concerned at the news． 听到这个消息时，他深为担忧。
We are all concerned about the pollution of the environment
here． 对这里的环境爱到污染，我们都感到不安。
Parents are naturally concerned for their children's
safety． 父母自然关心他们儿女的安全。
I am very concerned about her.我非常挂念她。
to concern oneself with public work关心公众事务
We're rather concerned about father's health.我们相当担心父亲的健康。
We are all concerned for [about] her safety.我们大家都担心着她的安全。
下面是concerning的例句：
This is a proposal concerning the construction of the new
airport． 这是关于兴建新机场的一项建议。
Yesterday we wrote him a letter concerning the business
arrangement． 昨天我们就业务安排问题写了一封信给他。
在个别场合下，concerned with可以和concerning互换使用，原因是从句which are
concerned with中的which are 省略了。例如：
We had several disputes concerning/（which are）concerned with
this matter．关于此事，我们曾争论过数次。
请注意，下列语句的区别：
They were concerned（worried）about the matter．他们为此事而担忧。
They were concerned（implicated）in the matter．他们参与此事。
They were concerned （connected）with the matter．他们与此事有关。
此外，作为特定词组，as far as I am concerned解作in my opinion；
as far as sth is concerned解作concerning sth/ talking about
sth.例：
As far as I'm concerned，this plan is
impractical．依我来看，这个计划不切实际。
As far
as funding is concerned，some banks have agreed to provide
loans．关于资金方面，一些银行同意提供贷款。
词形词义拓展：
unconcerned adj.漠然的， 漠不关心的;无关的，不相干的
= indifferent
It is quite indifferent to me whether you go or
stay.对你的去留我毫不关心。
I am indifferent to their arguments.我对他们的争论毫不关心。
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