1.They were happier yesterday than today.

=> Today we aren't as happy as yesterday.

2.English isn't so interesting as biology.

=> Biology is more interesting than English.

3.I'm not as good at English as him.

=> He is better at Maths than me.

4.His role is more important than mine.

=> My role isn't as important as his.

5.My kitchen is bigger than your.

=> Your kitchen is smaller than mine.

6.I hanen't got as much money as you.

=> You have got more money than me.

7.French is more difficult than English.

=> English isn't as difficult as French.

8.Nam isn't so careful as his father.

=> Nam's father is more careful than him.

9.Mai is prettier than her sister.

=> Mai's sister isn't as pretty as her.

10.Hai Duong isn't so noisy as Ha Noi.

=> Ha Noi is noisier than Hai Duong.

11.My house is smaller than his.

=>His house is bigger than mine.

1 Today we aren't as happy as yesterday.

2 Biology is more interesting than English.

3 He is better at Maths than me.

4 My role isn't as important as his.

5 Your kitchen is smaller than mine.

6 You have got more money than me.

7 English isn't as difficult as French.

8 Nam's father is more careful than him.

9 Mai's sister isn't as pretty as her.

10 Ha Noi is noisier than Hai Duong.

11 His house is bigger than mine.

Cấu trúc so sánh hơn tính từ ngắn: `S_1` + V + (Adj/Adv) + “-er” + than + `S_2`

Cấu trúc so sánh hơn tính từ dài: `S_1` + V + more + Adj/Adv + than +  `S_2`

Cấu trúc câu so sánh nhất tính từ ngắn: S + V + the + Adj/Adv + -est+ in/on/at...

Cấu trúc câu so sánh nhất tính từ dài: S + V + the + most + Adj/Adv+ in/on/at...

Cấu trúc so sánh bằng: `S_1` + V + as + (adj/ adv) + as + `S_2`

Cấu trúc so sánh bằng với danh từ: `S_1` + V + the same + (noun) + as + `S_2`