fun是名詞,比如have fun
funny是形容詞,比如,you are so funny.
倍數(shù)的表達(dá)方法1. 表示“幾倍大?。ㄩL短；數(shù)量）”,由“倍數(shù)+ the size（length,amount……）”結(jié)構(gòu)組成.
例如：
The earth is forth-nine times the size of the moon. 地球是月亮的49倍大.

2. 表示“……比……大幾倍”,由“倍數(shù)+形容詞（副詞）比較級”結(jié)構(gòu)組成.
例如：
This box is three times bigger than that one. 這個盒子比那個盒子大三倍.
The grain output is 8 percent higher this year than that of last year. 今年比去年糧食產(chǎn)量增加8%.

3. 表示“……是……倍”,由“倍數(shù)+ as +形容詞+ as +”結(jié)構(gòu)組成.
例如：
Our factory is twice as big as theirs. 我們的工廠是他們的三倍.
I have three times as many as you. 我有你三倍那么多.

[注] 一倍用once,兩倍用 twice.

4、還可以用by+倍數(shù),表示增加多少倍.
The production of grain has been increased by four times this year. 今年糧食產(chǎn)量增加了4倍.