Like many other inventors before him, professor Slawomir Suwak designed only the things he needed himself.
Professor Slawomir Suwak is an inventor.
Professor Suwak is not an inventor, but rather a mathematician.
He was not sure of anything.
Two women are baking a pie.
A dog is running.
I passed Callie's test.
The men are all playing chess and checkers at the local park.
The man is riding a three wheeler.