1. I’ll never forget (going) to school for the first time. I remember that day quite clearly.
2. David was happy (to find) his aunt.
3. I tried (to reach) the shelf but I wasn’t tall enough.
4. He likes (being invited) by his friends.
5. You don’t need (to paint) the door. It doesn’t need (painting).
6. Stop (arguing) and start (working).
7. ‘Did you remember (to lock) the door?’ ‘No, I’ll go back and do it now.’
8. If it is worth (doing), it is worth (being done) well.
9. ‘How did the thief get into the house?’ ‘I forgot (to shut) the window.’
10. They accuse him of (having robbed) their house.
11. If you can’t turn the key try (putting) some oil in the lock.
12. Have you finished (writing)?
13. He always helps me (to do) my homework.
14. He looks so funny. Whenever I see him, I can’t help (smiling).
15. She decided (not to buy) the car.
16. Do you mind him (being examined) by a cardiologist?
17. I don’t enjoy (going) to the dentist.
18. Excuse me for (breaking) your beautiful vase.
19. I clearly remember (having paid) him. I gave him $20.
20. After (saying) this he left the room.