reading is fun 为什么fun不加ly?

reading is fun 为什么fun不加ly? Reading is fun为什么不是read reading is fun 同义句 reading is fun l like it为什么用is Reading is a lot of (fun) what great fun it is to go hiking!为什么因为fun是不可数名词不加a,而不说它抽象名词 It is great fun为什么不加冠词?为什么a heavy rain加冠词?都是不可数名词,为什么一个加一个不加 what fun it is to swim 为什么不能用how? is cooking (a fun)?为什么不写funny what fun day it is?为什么用fun,不用funny 求英语作文 reading is fun 60字左右 求一篇150字的英语短文.reading is fun.