不同:
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
不同:
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