Correct: some mail, some advice, an apple, some traffic, some hair, some information, a job, some work, an essay, some homework, a friend, some sand, a piece, some news, a girl, an email, a hard drive, some cheese, some music, a problem, Incorrect: a mail, an advice, a apple, a traffic, some hairs, an information, an job, a work, some essay, a homework, some friend, a sand, some piece, a news, an girl, a email, an hard drive, a cheese, a music, some problem,

a / an / some

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