Draw a goat eating grass

Akpos was in the classroom when his teacher gave a class work that everybody in class should draw a goat eating grass.

When they all finish drawing they submitted their work for the teacher to grade, when the teacher wanted to grade Akpos' work, he noticed that there was nothing on the drawing book.

So he called Akpos to ask why he left the drawing book blank. Akpos replied and said "Maybe the goat has finish eating the grass and went away"