The original Greek is a series of double or deeper meanings. The first phrase means both "heal the sick" and "arouse the spiritually dead." The second (third in KJV) phrase, "raise the dying" also could mean "arouse the spiritually dead." The third (second in KJV) phrase means both "cleanse the lepers" and "transform the rough." The fourth, "cast out devils" also means "toss out divinity."
Unlike the previous verses that were translated as commands, the verbs here are in the form of commands.
Christ's Words in Matthew as a Guide to 40 Days of Prayer.