It is important that……与It is important to……为什么一个是虚拟,一个就不是?

It is important that……与It is important to……为什么一个是虚拟,一个就不是? I think that it is important to ……从句中的is要不要加?为什么? It is important that.一定是虚拟么? It is quite important for us to keep healthy.为什么是for不是to? 高中英语课本中有这样一句话：……and that it is important to have someone to 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 that enough time _____A_ to study. it is important to choose subjects that you find interesting 英语翻译It is important to realize that the same technology____h I find that it is important to do morning exercises 英语翻译用虚拟语气翻译：人人都要事先准备好,(it is important…)我觉得我翻译的没用虚拟语气而且翻译的不简