He wrote an ancient poem using the literary language form.

This textbook explains mainly in colloquial form.

He is completely nowhere to be seen.

Her necklace was in the beautiful shape of a butterfly.

This sentence is using the inclusive form.

This grammar rule is using the exclusive form.

Exclusive form of grammar is used to refer to a specific object only.

Let's calculate the inscribed circle of this polygon.

This shape is called a bicone.

When I looked into her eyes, the phrase 'the eyes are the window to the soul' came to mind.