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This apple is the biggest of all.
big
bigger
10 yuan
20 yuan
50 yuan
This pen is the most expensive of the three.
expensive
more expensive
The weather is bad.
The weather is worse.
The weather is the worst.
This car is the best of the three.
good
better
Grammar
语法
形容词最高级的变化：
规则的：
cheap—cheapest
big--biggest
friendly—friendliest
nice— nicest
comfortable—most comfortable
不规则的：
good--------better--------best
bad----------worse--------worst