It is quickly和It is fast 哪个是对的

who is it和who it is哪个对? I think it important.和I think it is important.哪个是对的? How sweet song it is和How a sweet song it is哪个对的 how it is going 和 how is it going,哪个是正确的呢? It can run fast.It run fast.哪个对 请问It is very kind of you .It is very kind to you .这两句话哪个是对的? There is your coat.Put it on quickly 的提问 it is of benefit…和it is of benefits…哪个对 为什么? :It is so fine weathu.和It is such fine weaher.哪个对! It is my first to和It is my first time to哪个对? how great is it和how great it is到底哪个对 是What,color,is,it?还是What,color,it,is?哪个对啊