"There are no ships there."
Translation:Nincsenek hajók ott.
so, if I understand correctly, when we have a number of something (2, 3 etc..) or a few, or a lot, you should use the singular, but when there is none, nothing, nada, you should use the plural. OK I know, you will tell me that ships is plural here. But four ships is also plural in English.
You are right. Of course, a noun can be in the plural. But as soon as you have something that indicates quantity/amount, the noun switches back to the singular. And that something can be a number, a unit of measure, some vague word like a few or a lot, or even a question word.