First Fight<br>Tom was into boxing. He was about to have his first amateur match. Tom won but had a lot of issues. It was a good learning experience. Tom kept getting better.
Tom didn't have a dog
Just in reading the passage above, there is no possible way you can determine whether or not Tom had a dog. He might have had a dog or he might not have, but it wasn't certain.
( z1 have :polarity - :ARG0 ( z2 person :name ( z3 name :op "Tom" ) ) :ARG1 ( z4 dog ) )