Negation contraction
can not
can't
Yesterday I went to school.
Yesterday I didn't go to school.
Ori didn't went to school yesterday, because he was sick.
did not
didn't
He is fixing the table right now.
He isn't fixing the table right now.
Every Wednesday they _____ go to school, because they're on a trip.
Every Wednesday they don't go to school, because they're on a trip.
are not
aren't
They are eating at the class right now.
They aren't eating at the class right now.
He _______ go to school now.
He doesn't go to school now.