have difficulty什么时候用doing,什么时候用to do?有什么区别?

have difficulty什么时候用doing,什么时候用to do?有什么区别? 什么时候用difficult什么时候用difficulty 用have difficulty doing 造句 用have difficulty in doing sth 造句 there doesn't seem to have been any difficulty solving the problem.为什么要用there不用it.到底什么时候用therer什么时候用it.我一直很混绕 have difficulty 后跟什么? have difficulty gainning have difficulty in have difficulty talking with your parents.为什么用have?difficulty是什么词性?为什么不用have a talk? have some difficulty 是用单数还是用复数 Many cities in the southern part of the United States have difficulty ___ traffic following when it snows.A.keptB.keepingC.to keepD.in being kept求详细分析.总是搞不清什么时候用动名词什么时候用不定式 have difficulty with sth 对么 .have some difficulty or difficulties? 什么时候用have got,什么时候用have have difficulty on sth对吗是不是have difficulty in doing sth,have difficulty on sth you can't imagine how much difficulty i had doing那么什么时候用to do have difficulty with sth中difficulty要不要遍复数? have some difficulty (in) doing sth.中的 difficulty可数吗