Rewrite the sentence below, inserting a participle or a participle phrase. Identify your participle as a present participle or a past participle. The sentence is: "The operation was made even more difficult by the presence of disease in the Central Zone."

Answer 1

"Complicating the operation, the presence of disease in the Central Zone made it even more difficult."

In this sentence, "Complicating" is the present participle.