concerned for/about sth/that …表示担心的；烦恼的；忧虑的 例：Conccerned parentss held a meeting. 忧心忡忡的家长们开了一次家长会。 We are all concerned for her safety.我们都为她的安全担心。 I'm concerned that thay may have got lost. 我担心他们可能迷路了。
be concerned with sth …表示与某事物有关；涉涉及某事物 例：Her lastest documentary is concerned with youth unemployment.她最近的一部纪录片是关于青年人失业问题。