11. Helen (be) 17 years old next Sunday.
12. She told me she (invite) all her friends to her next birthday party.
13. Tom (arrive)? - Not yet.
14. When Sarah came to the party, Paul already (go) home.
15. You (see) news on television yesterday, didn't you?
16. She didn't tell (somebody, anybody) about her plans.
17. Do you read (many, much)?
18. She paid for her ticket and (leave).
19. I couldn't open the office door because someone (lock) it.
20. When I phoned her, she (do) her homework.