1,Are you do homework right now?
=> doing : vì có now là dấu hiệu của thì HTTD => cấu trúc be V-ing
2,The childent play football in tha back yard at the moment
=> Are doing
3,What does your elder sister doing?
=> is
4,Look!Those people are fight with each other
=> fighting
5,Noah is tries very hard for the upcoming  exam
=> trying
Nếu cậu muốn giải thích tại sao làm vậy thì ib riêng t chỉ nhé
*Đừng quên tick điểm nha*