I find it difficult to learn English well.是什么句式？

I find （that）it is difficult to learn English.是主语-谓语+宾语从句.宾语从句中的主语 it 是一个形式主语,代表后面的实际主语 --- 不定式 to learn English.
I find it difficult to learn English 是一个不同的句型.它是主语-谓语-宾语+宾补的句型.I find 是主语、谓语,后面是宾语 it （形式宾语,实际宾语是后面的不定式to learn English）,再后面是宾语补足语 difficult .换句话说,如果不用 it 作形式宾语,句子就变成了：I find 【to learn English（宾语）】difficult 【宾补】.当然,没有人这么说.而是说成 I find it difficult to learn English.

I find it difficult to learn English well
我发现学好英语很难
宾语从句
正确语序
I find that learning English well is difficult
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我发现学好英语不容易。

The book which / that was bought last month was lost yeaterday