it is difficult to understand.中的it是什么词

parents found it is difficult/it difficult/it was difficult to teach children.说明选择原因 how difficult is it to save money? is it difficult to learn Japanese? It's difficult to take u out from my mind It's difficult to take u out from my mind it is difficult to do sth对还是it difficult to do sth对 it difficult to do sth 和it is difficult to do sth 的区别 是it is difficult to me to do sth还是it is difficult to me for sth还是it is difficult to me to sth it is difficult to understand.中的it是什么词 it is difficult to do /doingit is difficult 后接to do 还是doing It is often difficult to decide what to RT it is difficult to you to do the job it is difficult to understand.中的to是什么词 it is difficult it is difficult at I find it difficult to learn English well.这里,为什么不是it is difficult?求解! It is not difficult to learn English.___ ___ ___ is not difficult.同义句 It is difficult to convey …….difficult to 怎么连读!谢谢! It is easy to do A,but you'll find it difficult to do B.为什么不是it is difficult而是it difficult