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An; an A; the The; a The; an
an, The a,A. an,A. a, The
an ;A. an ; The a ;A. a ; The
a; the an; the a; an an; a
, the; A. an; A. a; The an; The
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something useful anything useful useful something useful anything
great useful little useful great use little use
a so useful book such an useful book a such useful book so useful a book
the, a a, the the, an a, an
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/；an；an the；an；the the；an；a a；a；an
a, the the, a the, an a, an
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