I have some problems finding out the answers为什么只能用finding而不能用to find
问题描述：
I have some problems finding out the answers为什么只能用finding而不能用to find
答
have problems (in) doing something 是固定搭配,前面省略了介词in,介词后面只能跟动词的ing形式.类似的还有：have trouble / difficulty (in) doing sth.做某事有困难have no problem (in) doing sth.做某事没困难,...