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問：
In the following example, why is "an" used before "FYI" and not "a"?
在下面的例子中，為什麼"an"用在"FYI"之前，而不是"a"?
Just an FYI, there is no school next Friday.
隻是告訴你一下（For Your Information），下周五不用上學。
答：
"A" is used before a word that starts with a consonant sound.
“A”用在以輔音開頭的單詞前。
"An" is used before a word that starts with a vowel sound.
“An”用在以元音開頭的單詞前。
Below are some examples:
下面是一些例子:
a cat
一隻貓
an apple
一個蘋果
a big elephant
一頭大象
an elephant
一頭象
a sweet sentiment
一段甜蜜的情緒
an irritating sound
一個惱人的聲音
Note that it is the sound and not the letter that matters:
注意，重要的是發音，而不是字母:
a unicorn (The first sound in "unicorn" is /j/, a consonant sound.)
一隻獨角獸(unicorn的第一個音是/j/，一個輔音。)
an honor (The first sound in "honor" is /ɒ/, a vowel sound.)
一種榮譽(honor的第一個音是元音/ɒ/。)
"An" is used before "FYI" because it is pronounced /ˌefˌwaɪˈaɪ/ and so the first sound is /e/, a vowel sound.
“An”用在“FYI”之前，因為它的發音是/ˌefˌwaɪˈ aɪ/，所以第一個音是/e/，一個元音。
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