no作为形容词性质时,在句中作定语,表示否定,译为"没有"、"不是",可修饰单数、复数可数名词和不可数名词.
所以：
I have no apple.和I have no apples.两句都正确
I have no apple.= I don't have an apple.
I have no apples = I don't have any apples.