1.  As every teacher knows, any well that yields enthusiasm is a precious resource.

2.  For starters, many teachers don't know how to use the gadgets.

3.  Good teachers know that lecturing on the American Revolution is far less effective than acting out a battle.

4.  His teachers already knew the score.

5.  Here, the teachers know the children.

6.  I realize that all history and geography teachers will know the answers to these questions without looking them up.

7.  I want parents to walk away thinking, 'This teacher knows my child."'

8.  If possible, let a teacher know you're doing that.

9.  If the teacher knows that he's teething, or that he got little sleep because of the previous night's storm, she can react accordingly.

10.  If the plan doesn't seem to be working, let the teacher know.