have you imagined that if you don't have lessons on time?
i think if you do that everything will go wrong
First,you won;t hear lots of things in the begining of the lesson so that you won't understand what teacher says then.
Next ,you'll have many questions about doing your homework,because many of your lessons you didn't hear.
Finally ,your teacher will be very angry because you are late for her class.it 's
the symbol of you don;t like her,and she may not like you.
Look,There will be many mistakes if you are late for class.
so we must have lessons on time .