1. I just know it bound to rain at the weekend.
2. He managed to give up smoking after three attempts.
He succeeded in giving up smoking after three attempts.
3. Are you able to tell which twin is which?
4. My parents say I'm not allowed to have a puppy.
My parents won't let me have a puppy.
5. If I were you I would take it back and complained.
You had better to take it back and complain.
6. I am supposed to wear a suit for work, but I often don't.
7. You had better not tell anyone about it.
8. He would refuse to put out his cigarette.