1. Tennis was played (by them) from four till five.
2. At twelve o’clock the trucks were loaded by the workers.
3. By six o’clock the trucks had been loaded by the workers.
4. This film will be shown on TV.
5. Have you been explained the rules of the games?/ Have the rules of the games been explained to you?
6. My skates haven't been brought back.
7. Has the letters been typed (by the secretary)? – No, they are being typed now.