1.
$\text{1.}$ We can't go camping today, can't we?
$\text{→}$ Câu hỏi đuôi
$\text{2.}$ They had lunch, but they have not had dinner.
$\text{3.}$ My brother has breakfast at 7 o'clock in the morning.
$\text{→}$ adv chỉ thời gian đứng cuối câu
$\text{4.}$ Most students have lunch at the school canteen.
$\text{→}$ adv chỉ địa điểm đứng cuối câu
$\text{5.}$ I think Vietnamese food is cheap and very delicious.
$\text{→}$ think + N/ V-ing + is + adj
