现在的年轻人发明了很多网络用语，有时我都听不懂他们在说什么．（difficulty）．

Question

现在的年轻人发明了很多网络用语，有时我都听不懂他们在说什么．（difficulty）___．

Answer 1

The young people today have invented quite a few“net language”．Sometimes I have difficulty understanding what they are saying．
本句是对所发生事情的描述和对事物的一种评价，故用现在完成时和一般现在时．
句子可使用what引导的宾语从句，作动词understand的宾语，have difficulty （in）doing sth做某事有困难．