I find it difficult to learn English 和 I find it isdifficult

1.I find it difficult to learn English.
主语：I；
谓语：find；
形式宾语：it；
宾语补足语：difficult；
真正的宾语：不定式to learn English
2.I find it is difficult to learn English.
1）主句为：I find...
主语：I；
谓语：find；
宾语（从句）：(that) it is difficult to learn English
2）宾语从句：it is difficult to learn English
该宾语从句的引导词that已被省略；
整个从句是主系表结构,其中从句的形式主语是it；is difficult是系表（be + 形容词difficult）结构；不定式to learn English是宾语从句的真正宾语.