1.The party would have been a great occasion if power weren’t cut suddenly.
2. Einstein was the physicist who has developed the theory of relativity.
3.the batteries in this radio need to change.
4.the police wants to interview Fred about the robbery.
5.if you were in class yesterday, you’d understand what the teacher’s talking about now.
6. If Tom didn’t spend much time on online games, his parents won’t be so worried.
7.John was promoted because he had been working hardly.
8.Norman hardly understands astronomy, but he talks as if he knows everything about it.
=>
1. Weren’t -> hadn’t been
2. Has developed -> developed
3. To change -> to be changed
4. Wants -> want
5. Were -> had been
6. Won’t -> wouldn’t
7. Hardly -> hard
8. Knows -> knew