I've come back with an excelent example I found in the book " communicate what you mean" :
He will success. I'm sure.
I'm sure that he will succsess.
As you see in this example which "that clause" is known by a noun clause, the clause exactly has not substituted with a part of sentence. It is the repeated sentence that has come first. So it doesn't act as a noun clause. What's your opinion?
Anonymous He will success. succeed. I'm sure.
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AnonymousHe willsuccess.succeed. I'm sure.
I'm sure that he willsuccsesssucceed.
If you really found "He will success" in a book, you had better throw that book away.
that he will succeed is a noun clause.
CJ