It's difficult___(learn)english well,but I think it's___(fun
It's difficult___(learn)english well,but I think it's___(fun
I think it necessary to learn english well.同义句
I think it's important (for us to learn)English well.为什么要填这个
I think it's for you to learn Chinese well
It's important ___(learn) English well
It's hard ______(learn) English well.
It's important to learn English well.
It's i_____ to learn English well.
It's necessary to learn English well.
I think it's(use)to study English well
I think it easy to learn English well.这里it后怎么没is?
I think it difficult to learn English well句中为什么用it?