Respuestas a la pregunta
Respuesta:
3. Jennifer hasn't finished her homework.
4. They have met the president.
5. No, we haven´t
6. Has Robert/He Visited Vancouver?
7. Yes, he has.
8. Mrs. Smith haven´t read the box.
9. He has been a teacher.
10. Have you been in jail?
11. I haven´t cleaned my room.
12. No, they haven´t,
13. Has she been sick?
14. Has he swam in the ocean?.
15. They haven´t arrived.
16. Where have they been?
17. We have lived here for a year.
18. What has he done?
19. It hasn´t rained for a long time.
20. Who have you finished the homework
Explicación:
Las oraciones en presente perfecto se les añade a I, you, we, they, la palabra have y el verbo el participio. Mientras que en She, It, he, se les añade has y el verbo en participio.
Tambien en negativa
Haven't + verbo en participio = We, They, You, I
Hasn´t + verbo en participio = She, it, He.
Espero te sirva. :)