1. I think you were wrong to sell your bike. (SHOULDN’T)
-> You
2. It was unadvisable to connect these two wires. (CONNECTED)
-> You
3. We took more luggage than was necessary on our holiday. (TAKEN)
-> We
4. It was not necessary for him to write to his mum because she rang him. (NEED)
-> He
5. His sister sent him some money, so he continued to study. (NOT)
-> If
6. It was a mistake to park outside the police station. (HAVE)
-> You
7. She came early last night, which wasn’t necessary because the party didn’t start still ten. (COME)
-> She
8. There’s no need for you to water the plants this morning. (NEEDN’T)
-> You
9. It was a waste of time worrying, after all! (HAVE)
-> You
10. He had wasted too much time playing games. He failed in the last examination. (WOULD)
-> If