I found that it was difficult to learn English.中that 可以省略吗?

I found that it was difficult to learn English.中that 可以省略吗? I found that it was frustrating to learn English grammar. He found that it was important to learn English well. I found it difficult that I learn English 句中的difficult是宾语补足语 I found that it was difficult to do the math probiem.I found Another thing that I found very difficult was English gramar Another thing that I found very difficult was English gramma Another thing that I found very difficult was english gramme 1.His English was so poor that he found it difficult to make I found ( )difficult to learn English grammar We found that it was very useful to learn English well.同义We Some students think it difficult to learn English well. That