Conventions of Composition Rule 8

Rule: A noun clause, if used as an appositive, doesn't need to be separated from the rest of the sentence with commas.

Example:

Wrong: The fact, that he has a criminal record, does not prove him guilty in this case.

Better: The fact that he has a criminal record does not prove him guilty in this case.

Practice deciding if and where these sentences need commas:

1. The situation that he has to do better in school to keep his scholarship makes his mother cry.
2. Automobile manufacturers don't seem to care about my opinion that cars should all have huge sunroofs.
3. The Halloween costume which he wore to the party left a trail of glitter.
4. We don't quite believe her claim that everyone will make the team.

Resources for further explanation of how to punctuate appositives:

English Grammar 101's Noun Clauses

Purdue OWL's Commas