I think it diffcult to learn English well.为什么it后面不is?it在这里的作用是什么?

I would like__maths,I think it's diffcult to learn I Think　it’s too diffcult 为什么要加it’s shecan not understand this passage.lt is ________.i think it is also diffcult for you I think it diffcult to learn English well.为什么it后面不is?it在这里的作用是什么? I find it diffcult to remember everything I used to think ____ pretty diffcult to understand what she said.A itB itsC it isD that it's so diffcult a question.i think he will have problems （ ）.A work it outB working it outC in working out itD work out it I think ___ not diffcult ___ English every morning.A.that;keep reading B.it's;keep readingC.that;to keep reading D.it;to keep reading I have a math,it's diffcult and boring改错 It's a diffcult i think english is diffcult [改为否定句超急,求马上回复 I think music is diffcult to learn改否定句 百度知道 I think it----question---- Think it over ,I think it's The math problem is very diffcult.You must ___ carefully.A.think it aboutB.think about itC.think over itD.Thank it over what do you think is the most diffcult in learning english?and how are you going to study it Tonight I will be able to finish my homework e___ ,because it is not diffcult T_____ English is diffcult,I should try to learn it well.