Identify the passive forms in the following sentences.
1. Many accidents are caused by dangerous driving.
2. I’m not often invited to parties.
3. During the night we were all woken up by a loud explosion.
4. Look at those old houses. They are being knocked dawn.
5. The room was being cleaned when I arrived.
6. Have you ever been bitten by a dog?
7. I’m not going to the party. I haven’t been invited.
8. Jim didn’t know about the change of plans. He hadn’t been told.
9. The new hotel will be opened next year.
10. George might be sent to America by his company in August.
11. Go away! I want to be left alone.