I have some problem (finish) my homeworkfinish 应该用什么形式

finishing
have some trouble\ problem\difficulty (in）doing sth
在做。。。方面有问题

应该是动词ing 形式， have some problem doing： 做某事有困难
如果是have a problem with：表示在 ...方面有问题或困难；

finishing;
have problems in doing sth:做某事有困难；in可以省略；

in finishing