Question

opening lines on if I were a teacher

Answer 1

If I were a teacher, I would treat my students as my child.
If I were a teacher, I would suggest good personality books to the students.
If I were a teacher, I would try to teach my level best to the students.

Answer 2

If I was the teacher I will try my level best to keep my students happy all times.
If I were a teacher I would be strict and equally loving.
And the most imp thing i would do is teach the values. 
And I would even teach self safety.