3. Yesterday, it was colder than today.
9. Last year, his salary was lower than this year.
10. Bob looks stronger than his brother.
- Form:
+Short adv/adj : S1+(V)+adv/adj –er +than+S2
+ Long adv/adj: S1+(V)+more+adv/adj+than+S2
(Riêng đối vs câu 10 ko dùng trạng từ vì sau các dộng từ chỉ giác gian (sense verns) như small, taste, look, seem,... thì theo sau nó là tính từ)
