有時，不同的`比較結構可以表示相同的意思，因此，它們可以相互轉換。
1. not as/ so……as與less……than的轉換
The place was not as/ so crowded as it usually is yesterday.
The place was less crowded than it usually is yesterday.
昨天，這個地方不像平常那樣擠滿了人。
2. more……than與less……than, not as/ so…as的轉換
Your picture is more beautiful than his.
His picture is less beautiful than yours.
His picture isn't as/ so beautiful as yours.
你的畫比他的好看。
3.最高階與more……than, no……more than的轉換
Math is the most difficult subject of all.
Math is more difficult than any other subject.
No subject is more difficult than math. 數學是所有學科中最難的。
