III.
1. Doing not -> not doing
2. Will visit -> would visit
3. Played -> had played
4. Having use -> Using
5. Have -> has
IV.
1. He wanted to be collected the stamps for him by his brother
2. Having considered what to say, my sister decided to talk to her headmaster
3. If the test weren't too difficult, we could do it well
4. She told Tom that if she had been he, she wouldn't have tell her about that
5. Harry congratulated Sue on getting engaged
6. If i hadn't been tired last night, i would have finished my work
