1. have been
several times → HTHT
*Cấu trúc thì hiện tại hoàn thành:
(+) S + has/ have + V_ed/ V3
(- ) S + has/ have + not + V_ed/ V3
(? ) Has/ Have + S + V_ed/ V3?
2. did
last night → QKĐ
*Cấu trúc thì quá khứ đơn:
(+) S + V_ed/ V2
(- ) S + didn't+ V_inf
(? ) Did + S + V_inf?
3. was reading
Hai hành động xảy ra cùng một lúc trong quá khứ → QKTD
*Cấu trúc thì quá khứ tiếp diễn:
(+) S + was/ were + V_ing
(- ) S + was/ were + not + V_ing
(? ) Was/ Were + S + V_ing?
4. will pass
I think + S + will + V_inf
*Cấu trúc thì tương lai đơn:
(+) S + will + V_inf
(- ) S + won't + V_inf
(? ) Will + S + V_inf?