student asking question

Why does it need "a" in front of "wartime milk shortage"?

teacher

Native speaker’s answer

Rebecca

The indefinite article "a" is put in front of "wartime milk shortage" because the "wartime milk shortage" is a new topic or event being introduced. Since "shortage" is a noun here, the article "a" is used to introduce "shortage", and all the particles of the sentence that go along with the noun "shortage" are put in between.

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