1. I can’t remember seeing him before.
2. After looking through and marking the student’s papers, the teacher handed them back.
3. She is angry at sending for.
4. You should avoid breaking rules.
5. She entered the office without noticing.
6. I am sorry for disturbing you.
7. We can’t excuse their not answering our invitation.
8. The cat was punished for breaking the cup.
9. The cat was afraid of punishing and hid itself under the sofa.