`2.` This is the most romantic story we have ever read.

`-` This/It is + (so sánh nhất) + S + have/has + V3/ed

`+` So sánh nhất (Tính từ ngắn)

`+` S + be + the + adj + -est + ...

`+` So sánh nhất (Tính từ dài)

`+` S + be + the most + adj + ....

`3.` No organisation in the world is larger than the United Nations.

`-` So sánh hơn (Tính từ ngắn)

`+` S + be + adj + -er + than + ....

`4.` This is the cheapest fan the store has.

`-` Cấu trúc tương tự câu `2`

`-----------`

$\color{yellow}{\lll \text{NhatHuy}
\color{orange}{\text{ThichChoiLiqi} \ggg}}$

2. This is the most romantic story I have ever read.

This is + the most + ADJ + N + S + has/have + V3/ed

3. No organization in the world is larger than The United Nations.

S + be+  ADj + er + than + O : ss hơn 

4. This is the cheapest fan the store has.

`color{orange}{~MiaMB~}`