it 的用法-1

"It" plague
it 瘟疫

错误句子
The rainy season is coming. It is too bad.

It 的用法
1：指代前面句子中的单数名词。

如果代词指代前面整个句子，必须用 this | that | which

应该修改为
The rainy season is coming. (This|That) is too bad.

注意 This | That 前面是句号

The rainy season is coming, which is too bad.

注意 Which 前是逗号，非限。

I won a lottery of 50 dollars. This is good.

I won a lottery of 50 dollars. That is good.

I won a lottery of 50 dollars, which is good.