How do you refer to plural nouns?

Question

I'm wondering how I can refer to a plural noun in the following sentence.

I lost my glasses. I need to get one.

(Talking about a single pair of glasses)

Since "glasses" is plural, I assume one doesn't suit here, but I don't know any appropriate alternative.

Answer 1

You could say:

I need to get some.

I need to get new ones.

I need to get a pair.

Either refer to them as plural, since you established them as a plural, or explicitly refer to the pair as a new singular item.