12.The farmers are working in the field now(thì hiện tại tiếp diễn)
13.He didn't listens to music after school yesterday(Thì quá khứ đơn)
14.My brother is playing football at the moment.(Hiện tại tiếp diễn)
15.They went home after they finished thier homework(quá khứ đơn)
16.My father buys a car after he saves enough money.(Hiện tại đơn)
17.Did they visit thier grandparents last summer?(Quá khứ đơn)
18.She said that she has already seen Dr.Rice.(Hiện tại hoàn thành)
18.Phong is sleeping right now(hiện tại tiếp diễn)
20.Sarah didn't enjoy her piano lessons when she was seven(Quá khứ đơn)