It is important to learn English.是主语从句吗?

l think that it is important to learn English well改为简单句 I think it important to study hard和l think it is important to study hard哪个句子是对的?为什么? I think it important to study hard和l think it is important to study hard哪个句子是对的?为什么? it is very important to people why is it important to speak English? It is important to be careful with is it important to look good?why? just like 和 It is important to why is it important to practice regularly? It is important to us (learn)English it is important to it is important for it is important of 这三个结构都有吗 都怎么用 it is nice to be important but it is more important to be It is important to like someone.It is very important to love yourself. That watch is important for me.l must f-----it l think it is important for kids tp learn how to manage ___money A a B an C the D / it is important for sb与it is important to的区别 it is important to me与it is important for me 的区别 it is important for living things 还是it is important to living things