This is a case of mistaken identity.

This is a case of great opportunity for our company.

The relative pronoun 'that' has two states, a nominative case and objective case, but there is no possessive case.

This test case will have a significant impact on similar cases.

There is no precedent for such a case.

They are the extreme cases.

That is not the case in Japan.

The case remains unsolved.

The password is case-sensitive.

The court judged the case.