no作形容词时,后面可以接单数名词、复数名词以及不可数名词.
There's no pen in my pencil case.
He saw no planes in the sky.
She has no milk.no + 单数名词 = nota/an +单数名词
There isn't a pen in my pencil case.

no + 复数名词 = not any + 复数名词
He didn't see any planes in the sky.

no +不可数名词=not any +不可数名词
She doesn't have any milk.