关于that作替代词that作替代词后面必须有修饰语吗?

关于that作替代词that作替代词后面必须有修饰语吗?
关于that作替代词
that作替代词后面必须有修饰语吗?

关于that作替代词that作替代词后面必须有修饰语吗?
不一定
I have a book.That is good
这里的that代替了book,可以当主语

后面应该要放is , are , was , were