I'm enjoying studying mathematics this term.
CORRECT!
Paul is working hard on his thesis at the moment.
CORRECT!
I live in England for six months.
I've lived in England for six months.
Elsa is never undersatanding which the healthiest things to eat are.
Elsa never undersatands which the healthiest things to eat are.
I've been knowing how to drive since I was eight.
I've known how to drive since I was eight.
Water is freezing at 0 degrees centigrade.
Water is freezes at 0 degrees centigrade.
Our principal is believing in demcracy in the classroom.
Our principal is believes in demcracy in the classroom.