i was having a hard time finding it until you came

问题补充：

i was having a hard time finding it until you came along.为什么find加ing

答案：

have a hard time doing,固定搭配 ,难于做某事,做.有困难的意思

======以下答案可供参考======

供参考答案1:

have doing

供参考答案2:

a 、hard加名词，finding是find的名词 或根据结构have a hard time doing