V.
25. go
⇒ Sau các Model verb ( can, could, must, should, may, might, ... ) là V_gốc
26. were not
⇒ " My uncle and aunt " là CN số nhiều, câu phủ định → thêm not.
27. is sleeping
⇒ DHNB thì HTTD: Be quiet !, " My child " là CN số ít.
VI.
28. Hung went to Da Nang last summer.
29. Because it was too far, and it was very hot, too.
30. They went to Da Nang by train.
31. They stayed in Da Nang for a week.
32. No, they did.
VII.
33. Last weekend, we had a picnic in the countryside.
34. He often goes to the post office to send a letter.
35. My mother usually cycles to work because riding bike is good for her health.
⇒ ( be ) good for sth: tốt cho cái gì đó.
36. Last year, I spent my summer vacation with my family in New York.