1. (+) My mother is cleaning the kitchen now
(- ) My mother isn't cleaning the kitchen now
(? ) Is your mother cleaning the kitchen now?
2. (+) He worked in Hanoi in 2010
(- ) He didn't work in Hanoi in 2010
(? ) Did he work in Hanoi in 2010?
3. (+) I will return to my hometown in 2 years
(- ) I won't return to my hometown in 2 years
(? ) Will you return to your hometown in 2 years?
*Cấu trúc thì hiện tại tiếp diễn:
(+) S + is/ am/ are + V_ing
(- ) S + is/ am/ are + not + V_ing
(? ) Is/ Am/ Are + S + V_ing?
*Cấu trúc thì quá khứ đơn:
(+) S + V_ed/ V2
(- ) S + didn't+ V_inf
(? ) Did + S + V_inf?
*Cấu trúc thì tương lai đơn:
(+) S + will + V_inf
(- ) S + won't + V_inf
(? ) Will + S + V_inf?
