I. Identify if the underlined part of the sentence us a noun clause,
Adverb clause or Adjective clause.
1. He says that he won't go.

Well, you did not provide any underlined part. I can only assume that you are referring to 'that he won't go.'

                noun clause

He says that he won't go.

Explanation:

I believe the underlined part is "that he won't go."

In this case, it is a "noun clause."

Explanation:

A "noun clause" is a dependent clause in a sentence. It acts as a noun, thus the name noun clause. In the sentence above, the noun clause is "that he won't go." This acts as an object of the verb "says."

Remember that a noun clause has a "subject" and a "verb." It is easy to spot a noun clause by taking note of the following words: that, what, where, why, whom, whomever, whatever, whether, etc.