英文選用 a an the

a
Count nouns use the article A/a if the noun starts with a consonant.

an
Count nouns use the article An/an if the noun starts with a vowel.

the
Both count and non-count nouns use the article the to make a noun more specific. This article is used for unque persons, places, things, and musical instruments.

I got a newspaper at a drugstore. 我從一間藥房買了一份報紙.
I got a newspaper at the drugstore. 我從這間藥房買了一份報紙.
I've got an invitation right here.

a/an/the invitation

usually u use "an" when the front letter of the next words starts
with a, e , i , o and u

that means it should be an invitation

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a,單數用,e.g. a vet 一個獸醫/獸醫,an egg 注意,詞後有S不能+
an,單數用,不過名詞的第1個字係要A,E,I,O,U先可以用,冇A,E,I,O,U唔可以用,只限第一個字,e.g. an egg注意,詞後有S不能+

the有多個用法,有 一 這(個),那(個) 二 這些,那些 三 用於形容詞,副詞比較級前)越...越... 4 (用於比較級前)更加 e.g The sooner, the better

hope你可以給我最佳回答,多謝