His writing is so confusing that it's difficult to make out what it is he is trying to express.
问题描述：
His writing is so confusing that it's difficult to make out what it is he is trying to express.
句意能看懂,但总觉得后半段“what it is he is trying to express”有点讲不通···
答
意思是：他写的东西很混乱,所以很难理解他在表达的东西是什么.整体使用so……that结构,it's difficult to make out what it is he is trying to express在His writing is so confusing 这个原因下形成的一个结果状语...“he is trying to express做的是what的定语”，你确定？事实上我就想弄懂这个·····本来觉得应该是强调句的特殊疑问句形式。what是被强调的部分，但是强调句的特殊疑问句形式应该是what is it that+其他成分，that必须出现，结合这儿应该是make out what it isthat he is trying to express，但是你给出的句子里面没有that，所以只能判断是定语从句，what在定语从句中作express的宾语，所以引导词that给省去了。希望帮助到你，学习进步。