you can't imagine how much difficulty i had doing那么什么时候用to do
问题描述：
you can't imagine how much difficulty i had doing那么什么时候用to do
答
其实这句中的从句补充完整应该是这样的:I had many difficulty (in)doing
省略了in ,就像I have problem (in) doing.
这种是固定搭配,应该不会用to do我有麻烦去做。。。。。。I have trouble (in) doing，这个跟上面的搭配是一样的那有没有to do的跟别的搭配有，例如I havemuch homework to do额我指这个***troubleI had to doI have some troubleto solve，不过这是由困难去解决，而不是在某方面有困难。如果表示在某方面有问题，与前面的存在固定搭配，则不会存在to do。如果不是do这部分不属于从句里，则会存在用 to do .关键在于断句