*Công thức :
S + have/ has + V3
He/ She/ It/ Danh từ số ít / Danh từ không đếm được + has + V3
I/ We/ You/ They/ Danh từ số nhiều + have + V3
* VD :
She has written three books and now she is working on the fourth one.
Have you ever been to Korea?
My father has watched the football match for over one hour.