it is difficult to understand.中的it是什么词

it is difficult to understand.中的to是什么词 It is difficult to understand what she has said it is difficult to understand scotish people if you () their it is difficult to make myself(understand)in that place. 英语翻译It is difficult to get a man to understand something whe It is difficult for people to understand his action; you can I found it is very difficult to understand what the foreigne It is difficult to find it is quite difficult for me to pass the exam中的for me 是什么成分呢 This question is very difficult.( )people can understand it. 1.Lesson is very difficult,but _____ people understand it. The question is too difficult I __ (not understand) it