一、concern作动词
1. 关系到；影响
The World Cup taking place in Germany concerns all the fans throughout the world.
在德国举行的世界杯足球赛影响到全世界所有的球迷们。
注意：其过去分词concerned常用来作表语，意为“和……有关；牵涉”；而作定语，则意为“有关的”。
It is reported that the pop singer is concerned with selling drug.
据报道，那个流行歌手涉嫌贩毒。
He asked all concerned to take an active part in helping the girl.
他要求所有相关的人积极帮助那个女孩。
2. 使担心；使关心；使烦恼
The boy's poor performance at school concerned his parents.
这个男孩在学校很差的表现，使他父母很担心。
注意：其过去分词concerned通常作形容词用，意为“担心的；烦恼的；忧虑的”。 The concerned parents were all concerned for the children's safety. 忧心忡忡的家长们都为孩子们的安全担忧。
二、concern作名词
1. 有关……的事（可数）
That's my concern, so I'll do as I like about it.
那是我的事，因此，我想怎么做就怎么做。
2. 关怀；关心（不可数）
Some people don't show much concern for our environment.
有些人不太关心我们的环境。
3. 焦急；忧虑（不可数）
There is now considerable concern for their illness. 现在对他们的病相当担心。
4. 对某人来说最重要或最感兴趣的事（可数）
What are your main concerns as a golf player? 作为一个高尔夫球员，你最关心什么？
1. 关系到；影响
The World Cup taking place in Germany concerns all the fans throughout the world.
在德国举行的世界杯足球赛影响到全世界所有的球迷们。
注意：其过去分词concerned常用来作表语，意为“和……有关；牵涉”；而作定语，则意为“有关的”。
It is reported that the pop singer is concerned with selling drug.
据报道，那个流行歌手涉嫌贩毒。
He asked all concerned to take an active part in helping the girl.
他要求所有相关的人积极帮助那个女孩。
2. 使担心；使关心；使烦恼
The boy's poor performance at school concerned his parents.
这个男孩在学校很差的表现，使他父母很担心。
注意：其过去分词concerned通常作形容词用，意为“担心的；烦恼的；忧虑的”。 The concerned parents were all concerned for the children's safety. 忧心忡忡的家长们都为孩子们的安全担忧。
二、concern作名词
1. 有关……的事（可数）
That's my concern, so I'll do as I like about it.
那是我的事，因此，我想怎么做就怎么做。
2. 关怀；关心（不可数）
Some people don't show much concern for our environment.
有些人不太关心我们的环境。
3. 焦急；忧虑（不可数）
There is now considerable concern for their illness. 现在对他们的病相当担心。
4. 对某人来说最重要或最感兴趣的事（可数）
What are your main concerns as a golf player? 作为一个高尔夫球员，你最关心什么？