Formal attire is required for the event.

It's a formal event.

The platforms offer a breathtaking view of the city.

They form a great team.

The cathedral's formeret is beautifully sculpted.

The atypical forms of the disease are difficult to diagnose.

Oil platforms are installations used for offshore oil extraction.

Canonical forms are important in mathematics.

You have to be tactful when meeting your in-laws.