“If I hadn’t had so much work to do, I would have gone to the movies.” said the boy.

As the boy did not have much work to do, he went to the movies.

The boy said that if he hadn’t had so much work to do, he would have gone to the movies.

The boy explained the reason why he had so much work to do that he couldn’t go to the movies.

The boy didn’t want to go to the movies because he did have so much to do.