I don't have much pens in the pencil box错在哪?

I don't have much pens in the pencil box错在哪?
I don't have much pens in the pencil box错在哪?

I don't have much pens in the pencil box错在哪?
much-----many
pens是可数名词,不能用much修饰

much 要改成many.
much修饰不可数名词的单数，而many 修饰可数名词的复数。

much改为many 或改为any
much修饰不可数名词.