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The noun "glass" can be both countable and uncountable.

glass → uncountable

Meaning: the material used to make windows, bottles, fishbowls, etc.

Example sentence: Milk used to be sold in glass bottles, but now it comes in plastic containers.

glass → countable

Meaning: a drinking vessel made of glass

Example sentence: My daughter knocked over a glass of milk and it spilled all over the table.

Quick Quiz:

In which sentence is the word "glass" countable?

a. The glass they poured my beer into was cracked, so I didn't drink it.

b. The glass in this window is cracked, so we should replace it.

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Contributor: Matt Errey