Use the infinitive with or without to. 1. i had better (not/smoke). 2. i forgot (do) my homework yesterday. 3. i heard them (come) late at night. 4. you won't be able (go) to the party if we dont find the keys. 5. i couldn't go to to the cinema because i had (look) after my little sister. 6. susan would rather (study) for her exam tomorrow. 7. can you tell me how (get) to the bus stop?

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 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?