1.   A school of fish swam around her feet, some nipping at her ankles.

2.   Unfortunately, I was in doubt a lot and wound up with a virtual school of commas swimming through my sentences.

3.   A school of porpoises swam abaft the fishing boat.

4.   Behind her, a school of goldfish swam across the shower curtain.

5.   I was lucky to be enjoying the early evening on my balcony when a school of dolphins swam by.