it 's i__for students to learn english well

it 's i__for students to learn english well It's important to learn English well. It's i_____ to learn English well. It's necessary to learn English well. Some students think it difficult to learn English well. That It's n( ) for us to learn English well. It's important for us to learn English well. it's very inportant to learn English well 同义句 He finds it's really hard to learn English well. It's important to learn English well.变成同义词 It's difficult to learn English well.（改为同义句） To learn Englis it's not easy for people to learn english well.为什么要用to learn