其实从语法上来说,两个都是行的,不过运用到的知识点不一样而已1.we think that is necessary 我们认为那是有需要的.主语 we 谓语 think 宾语从句 that is necessary.that在从句中充当主语,是一个代词,代指“那个,那...I could't understand【 what 】was the matter with me.还是…what the matter was with me这里 I couldn't understand后面what引导一个宾语从句，宾语从句后面的语序是陈述的，而遇到the matter 时，比较特殊，有两种情况。1. 语序是 what was the matter 时，意思是“有什么问题”， 主语是what, 宾语是was2. 语序是 what the matter was时，意思是“这物质是什么”，主语是the matter“这物质”， 谓语是was而这里有个with me,根据句意，是“我出什么问题了”，所以是 I couldn't understand what was the matter with me. /I couldn't understand what was wrong with me.