It's wrong to forge signatures.
There is a class trip coming up and Ted is worried that his mother won't sign his permission slip because of his poor grades.
Ted wants to go on the trip.
Ted works hard in class to bring his grades up and then asks his mother to sign his permission slip for the trip.
Ted signs his mother's name on the permission slip for the trip to make sure that he can go.
Ted is happy that he is doing better in the class and looking forward to the trip.
His mother finds out that he signed her name, Ted is grounded and can't go on the trip.