동격의 that이 아닌 문장을 찾아주세요

동격의 that에 관한 질문이에요.
아래 다섯 문장 중에서 동격의 that이 아닌 문장이 어떤 것인지 궁금합니다.
1. The thought occurred to me that I might be mistaken.
2. I have no doubt that he is a man of character.
3. Her impressive face gave no sign that she had heard the conversation.
4. His fear that things may go wrong has no foundation at all.
5. He taught me the difference that there is between what is right and what is wrong.