（困惑中...）Candy这个词到底可不可数?为什么有some candy也有Halloween candies?

（困惑中...）Candy这个词到底可不可数?为什么有some candy也有Halloween candies? Candy是否可数比如,he often buys some candy还是candies Let's buy some Halloween ____.(candy) 何时candy,candies business到底可不可数?我看到有some urgent business,但也有an urgent busines candy和candies的区别 candy 可数么wedding candy 可数么? candy candy是不是可数名词? candy可数么? candy 可数吗 candy paper可数吗?