Công thức:
Phủ định:S+hasn't/haven't +been+V-ing.
Ex:They haven't playing video game since 2019
Khẳng định:S+has/have+been+V-ing.
Ex:He has been playing baseball for one hour
Nghi vấn:Has/have+S+been+V-ing?
Ex:She go to school over an hour ago,right
Xin hay nhất +5 sao ạ !