I have been teaching special education now for 12 years.

Most have been teaching for more than six years in city schools.

He also taught political science at the university for six years.

I've taught for 15 years in a public high school.

He taught common and high schools for five years 1897-1904.

He later taught science in middle school for 10 years.

In addition to his research, he taught at the University for 25 years.

She taught at the university for 46 years, beginning in 1892.

Later, she became a science teacher and taught at the middle school level for 25 years.

He taught at the same school for the next 40 years.