（重写句子） Fire, insects, disease, and wind continue to damage our forests. As a result, we see further reduction of our forests every year. (complex sentence)

（重写句子）Just 30 years ago, two out of three American families consisted of a father, a mother, and their children. Today, less than one family out of five fits that description. (compound sentence)

（重写句子）I would act differently if I were in your position. (periodic sentence)

（重写句子）The firemen cut down trees so that they could prevent the fire from spreading.(simple sentence)

（重写句子） Tony was a hard-working student. He was energetic. And he was also imaginative. (parallel structure)

（重写句子） The people were standing on the bridge. They waved to the pilot. The pilot did not notice them. (compound-complex sentence)

（重写句子）The audience complained because the ushers(引座员) continued to seat people after the play had started. (periodic sentence)

（重写句子） My sister went to Tokyo for a holiday. She could not return home. She did not have enough money left for a plane ticket. (long sentence)

（修改病句）Mary became a vegetarian. Because she didn't want to eat anything that had a mother.

（修改病句） Shortly after the Spring Festival, Xiao Lin returned to Shanghai preparing for a job interview.