concern这个词怎么用?比如关心某人怎么说?它的同根词concerned了

及物动词
1. 关系到；影响,涉及(某人的)利害.
The matter concerns the safe operation of the vehicle.
2. 使关心 (with),担心,挂念,忧虑 (for, about, over) (参看 concerned).
Don't concern yourself with this trivial matter.
He is very concerned about his mother's health.
名词
1. 关系；利害关系.
This incident is a concern of every citizen.
2. 关心,挂念,担心.
The concern is that the damage to the car cannot be repaired.
3. 商行,公司；财团；康采恩；事业,业务；(pl.)事件,事情.
John's new business is a going concern.

be concerned about sb.
I am concerned about you. 我关心你。

这个词一般指相关于，关心某人一般不用这个。care about somebody 就可以了。