I have been teaching special education now for 12 years.

He has been teaching for just short of 20 years.

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

I've only been teaching for seven weeks, but it took me 10 years to become a teacher.

She taught at both schools for the rest of her life.

I teach for 25 hours in a 35 hour week.

She taught music at the university for the next three years.

Then at age 17 he taught school for another three months.

He taught at the local high school for a number of years.

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