- Noun clause
I don’t know [something] (direct object)
that he was the author. (direct object noun clause)
*when noun clause is direct object, “that” can be omitted
I know (that) he passed the test.
I believe (that) we’re going to the mall.
*noun clause can be replaced by “so” in short answer.
Did Pam make it? 1. Yes. I think that she made it.
2. Yes. I think so.