I think ------necessary to learn Einglish well.中的-------上填it正确吗?

I think i think I Think I think I i think i love i think i love i think so i I think I’m I think I understand it作形式宾语——find/think/belive+形容词/名词/for sb.+to do sth.例句：we all think it necessary to do exercise.关于这个句式,为什么不是it+is+形容词/名词 即：we all think it's necessary to do exercise.此时 it's necess I think I think too much. I think--I think too much. I will think about everytime i think about I think of you I think English easy i think doing sth I think( )Tom's