Use the infinitive with or without to. 1. I had better (not/smoke). 2. I forgot (do) my homework yesterday. 3. I heard

1. I had better not smoke. 2. I forgot to do my homework yesterday. 3. I heard them come late at night. 4. You won\'t be able to go to the party if we don\'t find the keys. 5. I couldn\'t go to the cinema because I had to look after my little sister. 6. Susan would rather study for her exam tomorrow. 7. Can you tell me how to get to the bus stop?