12. Beatriz …………. (walk) to work alone. 13. Oliver ……….. (not allow) her to go out. 14. Eliza ………. (invite) you to the party. 15. Some people ……….. (forget) that day. 16. The bus ……….. (arrive) quite late this morning. 17. The Queen ……… (appear) on Television. 18. Fiona ………. (not brush) her teeth yet. 19. Samuel ……… (knock). 20. Anne …… (buy) them. 21. Teo ………… (drink) it. 22. You ……….. (see) it. 23. The bird …….….. (sing).

12. Beatriz has walked to work alone.

13. Oliver has not allowed her to go out.

14. Eliza has invited you to the party.

15. Some people have forgotten that day.

16. The bus has arrived quite late this morning.

17. The Queen has appeared on television.

18. Fiona has not brushed her teeth yet.

19. Samuel has knocked.

20. Anne has bought them.

21. Teo has drunk it.

22. You have seen it.

23. The bird has sung.

Здесь используется время Present Perfect:
have/has + третья форма глагола (Past Participle).

С местоимениями и существительными в единственном числе употребляется has: Beatriz has walked, the bird has sung. С you и существительными во множественном числе употребляется have: you have seen, some people have forgotten. В отрицательных предложениях ставится not после has/have: has not allowed, has not brushed.