A teacher is teacher her class of young children how to do math problems.
A teaching is teaching a class of young students
A professor teaches college students physics
There is a bird outside flying.
The man is walking outside.
You go back at the end of the semester to do your final exam.
there is a man and a boat in the picture
A man is playing a guitar in a large tent with an audience watching.
Laws were passed that required action on the part of agency management.