3. The workers often go to work by bus
<HTĐ có từ chỉ mức độ là often>
PD : The workers don't often go to work by bus
NV : Do the workers often go to work by bus?
dịch : Người lao động thường đi làm bằng xe buýt
4. Minh plays the piano every day
<thì HTĐ vì có từ nhận biết là every day>
PD : Minh doesn't play the piano every day
NV : Does minh play the piano every day?
dịch : Minh chơi piano mỗi ngày

1.You can turn left
->You can't turn left
->Can you turn left?
2. His mother is cooking the meal
->His mother isn't cooking the meal
-> Is his mother cooking the meal?
3. The workers often go to work by bus
-<The worker often don't go to wowork by bus
->Do The worker often go to work by bus?
4. Minh plays the piano every day
->Minh doesnt play the piano every day
->Does Minh play the piano every day?