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