How do you find it? 成了你怎么找到/发现它的？所以不能这么造句。find it difficult 实际上是省略了to be, 即 I find it to be difficult. 所以你补上to be就可以避免误解。How do you find it to be? 由于 I find it difficult.和 I find it is difficult.意思是相同的。所以你可以先把复合宾语改为that从句，然后针对that从句的表语提问。How do you find it is?  也可以把find 改为其它意义相近的动词，如 How do you think of it?