it is important to it is important for it is important of 这三个结构都有吗 都怎么用

I( )it is important to sieep eight hours a night. i think it important to do sth为什么不能是i think it is important to do sth I think it important to keep healthy 与I think it is important to keep healthy 区别 if I want to say something is probably important,can I write May be it is important? I think that it is important to ……从句中的is要不要加?为什么? Your f -----is very important to me.I don’want to lose it. even i pls it is very important to add mre to your contacts i find it important to keep myself healthy important 后为什么加to 不是只能是it is后才加to么这个没有is啊 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 I FIND IT IMPORTANT TO LEARN ENGLISH. i found it important to stard hard i think it is very important to do something.&i think it very important to do sth.两个句子都对吗?区别在哪里呢