不可以改成what we concern about,但是可以写成what we concern,concerned不是被动语态,而是过去分词做表语,be concerned about 是词组,concern是及物动词,后面直接加宾语或宾从,to是介词,与extent连用,to...extent...非常感谢！你说的是to what extent tests做主语吧还有整句可不可以把what ··is去掉改成"we are concerned about that to what extent`````?"　　在is后面的表语从句中，tests做主语， to what extent做状语，翻译过来是测验对学生创造力的危害到怎样的程度，可以改成"we are concerned about that to what extent`````，不要问号，此时从整个句子是陈述句