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.
In which sentence is the word "glass" countable?
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Contributor: Matt Errey