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
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concern about 和be concerned about意思相同吗
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翻译他对细节不感兴趣为什么不词组be concerned about或show concern about,而要用con
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concern 及物动词,使担忧,但为什么还有 be concerned about
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用upset be concerned about suffer from
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i am concerned about you .其中的concern 为什么加ed?