2 câu trả lời
1. Khẳng định:
S + am/ is/ are + V-ing
2. Phủ định:
S + am/ is/ are + not + V-ing
3. Câu hỏi:
Am/ Is/ Are + S + V-ing ?
(+) S+is /am/are+V-ing...
(-) S+ is/am/are+not+V-ing
(?) Is/Am/Are+S+ V-ing?
->Yes,S+is/am/are
->No,S+is/am/are+not