teacher是不是可数名词?

　　How well does the teacher structure the lessons?

　　老师对课程组织安排得如何？

　　The teacher assigned a different task to each of the children.

　　老师给每个儿童布置的作业都不相同。

　　Patience is one of the most important attributes in a teacher.

　　耐心是教师最重要的品质之一。