1.In Japan most students take trains to school.(改为同义句)
In japan most of the students go to school by train.
2.He is the most careful student in our class.(改为比较级)
He is more careful than anyone else in our class.
3.Both of us are students.(改为否定句)
Neither of us is a student.
4.It's time to go to school.(to go to school划线提问)
What is it time to do?