Today it 为什么不写成Today it was rained

Today it 为什么不写成Today it was rained becase it rained today Today it rained.It was _____ _____boring(有点儿). 找错：It rained hardly today. It rained yesterday as[ ](heavy) as it does today. It was very hot yesterday,but it is _______ today.请问这里为什么不能用 用【Today it rained】这个句式说【今天阳光明媚】 - it's so cold today!- ( ) yesterday.括号中为什么选so was it ,而不选so It's so cold today.Yes,it;s colder than it was yesterday.为什么 The weather was ______ it is today. it is today.it It hasn't rained for a week ang it __(be not)cloudy today