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问：
In the following example, why is "an" used before "FYI" and not "a"?
在下面的例子中，为什么"an"用在"FYI"之前，而不是"a"?
Just an FYI, there is no school next Friday.
只是告诉你一下（For Your Information），下周五不用上学。
答：
"A" is used before a word that starts with a consonant sound.
“A”用在以辅音开头的单词前。
"An" is used before a word that starts with a vowel sound.
“An”用在以元音开头的单词前。
Below are some examples:
下面是一些例子:
a cat
一只猫
an apple
一个苹果
a big elephant
一头大象
an elephant
一头象
a sweet sentiment
一段甜蜜的情绪
an irritating sound
一个恼人的声音
Note that it is the sound and not the letter that matters:
注意，重要的是发音，而不是字母:
a unicorn (The first sound in "unicorn" is /j/, a consonant sound.)
一只独角兽(unicorn的第一个音是/j/，一个辅音。)
an honor (The first sound in "honor" is /ɒ/, a vowel sound.)
一种荣誉(honor的第一个音是元音/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，因为它的发音是/ˌefˌwaɪˈ aɪ/，所以第一个音是/e/，一个元音。
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