* Cấu trúc :
a) Thể khẳng định ( Affirmative form ).
I / You / We / They + have + been + V-ing
He / She / It + has + been + V-ing
Eg : It has been rainning all day . ( Trời mưa suốt ngày . )
b) Thể phủ định ( Negative form ).
I / You / We / They + have + been + V-ing
He / She It + has + been + V-ing
Eg : Our team hasn't been doing very well lately.
( Gần đây đội chúng tôi không chơi tốt lắm . )
c) Thể nghi vấn ( Interrogative form ).
Have + I / You / We / They + been + V-ing
Has + He / She / It + been + V-ing
Eg : Have you been waiting long ? ( Bạn đợi lâu không ? ).
