1. My mother didn't buy anything.
(Chủ ngữ + did not + V + O)
2. The weather is warm in spring.
(Chủ ngữ + tobe + Adj + O)
3. You should drink warm water.
(Chủ ngữ + should (not) + V + O)
4. Did you stay at home yesterday?
(Did + Chủ ngữ + V + O?)
(Chúc bạn học tốt).