school 40%
He sometimes takes a subway to school.
school 0%
He never rides a motorcycle at school.
work 40%
He sometimes drives a truck at work.
school 100%
He always rides a bicycle to school.
work 0%
They never fly a helicopter at work.
work 0%
He never drives a tractor at work.
work 40%
They sometimes drive a fire engine at work.
work 100%
They always drive a police car at work.