it is awful take a walk on such a bad day这个句子是否正确

问题描述:

it is awful take a walk on such a bad day这个句子是否正确

不对应该是:It's awful to take a walk on such a bad day.to是要作真主吗?那什么时候是这种句型?it's +形容词+ to do sth to do 做句子的主语, it 是形式主语