be concerned about ,concern about 不都有担心……的意思吗?为什么省略句中不能用conc

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be concerned about ,concern about 不都有担心……的意思吗?为什么省略句中不能用concerned?
be concerned about ,concern about 不都有担心……的意思吗?为什么省略句中不能用concerned?例 concerning（为什么不能用concerned?） about his mother,he didnt go to school.在说worry 省略句一般都是worried about …… ,he…… 很少用worrying about…… ,he…… 为什么?

He is concerned about this problem.
be concerned about 关心
He concerns about this problem 语法错误,concern about 不可作为动词用,可以：
He expressed concern about this problem.
concern 作动词是及物动词：
vt.涉及,关系到；使担心

be concerned about ,concern about 不都有担心……的意思吗?为什么省略句中不能用conc concern about 和be concerned about意思相同吗 be concerned about concern about 请问be concerned about 是担心的意思,如 i am concerned about his healt be concerned about和concern about的区别 concern 及物动词,使担忧,但为什么还有 be concerned about be concerned about 和 concern about 什么区别? concern的用法关心某事是不是sb be concerned with sth那么concern about 最好有 concern abou和concerned about的区别?concern with是使关心的意思,是被动语态吗?请英语中concern 和 be concerned about 有什么区别? be concerned about的concerned是形容词吗?还是被动类似be concerned about的