12. I started cooking for the party 2 hours ago.
I have__________________________
13. She started to work as a doctor 6 years ago.
She has ______________________________________
14. My father is reading a newspaper. He started an hour ago.
My father ________________________________________
15. It is years since my sister used English.
My sister has _____________________________________
16. Scientists began fighting against SARS-CoV-2 in 2019.
Scientists have ___________________________________
17. The Browns began living in London 20 years ago
. The Browns have _____________________________
18. John started to work for this company in 2019.
John has ________________________________________
19. He started planting flowers some years ago.
He has _____________________________________________
20. Many students in Phu Tho started to study online some months ago. Many students in Phu Tho have _________________