Our opinions differ.

That statement is different from the truth.

He recorded the day's events in his diary.

When he learned that fact, he was surprised.

As a matter of fact, he is the leader of our team.

We went to the scene for fact-finding.

He falsified the fact to hide his mistake.

His mistake of fact caused a big problem.

His claim does not match the actual relationship.

That rumor is groundless.