`28` - Camping isn't as expensive as booking a hotel room.

`-` S + be + not + as + Adj + as + O: So sánh ngang bằng với tính từ

`29` - Cuc Phuong National Park is the oldest national park in Vietnam.

`-` S + be + the + Adj-est + N: So sánh hơn nhất với tính từ

`30` - The beach holiday this year was worse than the sightseeing tour we took last year.

`-` S1 + be + Adj + than + S2: So sánh hơn với tính từ

`31` - Tim is as excited as Diana about the camping trip tomorrow.

`-` S1 + be + as + Adj + as + S2

`32` - This is by far the most enjoyable sightseeing tour I have ever had.

`-` S + be + the most + Adj + N: So sánh hơn nhất với tính từ dài