We went down the river by boat.

He remained silent and didn't say anything.

He puffed out a breath after climbing the long stairs.

After running up the stairs, he breathed heavily.

She loves writing fan fiction.

Recently, his popularity has been increasing.

I could see the beautiful sea from the porthole.

A positive-definite matrix is an important concept in linear algebra.

She is conducting research on the world's oldest profession.

He publicly acknowledged that he is a transsexual.