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Here’s the secret to making the rule work: The rule applies to the sound of the letter beginning the word, not just the letter itself. The way we say the word will determine whether or not we use a or an. If the word begins with a vowel sound, you must …

2017年11月5日 · So, remember, "a" or "an" depends on how you pronounce the word/abbreviation/acronym. If the pronunciation begins with a vowel, it's "an." If it begins with a consonant, it's "a." The "exception" is for words beginning with "H." The old rule states that all words beginning with "H" take an "an" ("I'll revisit the matter an hundred fold").

冠词分两种：不定冠词 a/an 和定冠词 the。 要选用 a 还是 an, 要取决单词是否以元音开头（非拼写）。 a 用于辅音音素或半元音音素开头的单词前。 an 用于元音音素开头的单词前。 hour 的第一个字母虽然是辅音拼写，但是按照元音发音。 I saw an old man with a cat. 我看到一个老人带着一只猫。 She has got a good job. 她找到了一份好工作。 Mike is a doctor. 迈克是一名医生。 London is an interesting city. 伦敦是一座有趣的城市。 When he was a child, he enjoyed …

2017年1月23日 · MD stands for "Molecular Dynamics". Since "M" is pronounced "EM", I thought it must be "an". I found both usages on the web through searching in Google. It is one of the extremely rare universal rules of English: the indefinite article an is used with words that begin with vowel sounds, and a with words that begin with consonant sounds.

So, we say “a dog” and “a balloon” or “an urgent message” and “an ant” but also “a useless pen” and “an hour.” Some words, like historic, can follow either a or an. In the eternal, and generally fruitless, quest to find some way to make English make sense, many people look for simple rules to apply to our language.

2021年4月27日 · The sentence "I am an alumnus and wondering..." is a statement, not a question. "Wondering" falls short of posing an actual question, so the question mark you've put at the end is improper.

不定冠词有a和an两种形式。 a用于以 辅音音素 开头的单词前，an用于以 元音音素 开头的单词前。 如： 对于还没有掌握音标的同学来说，区分单词是元音开头还是辅音开头可能比较困难，那可以先记语a,e,i,o,u这五个元音字母，一般以这五个字母开头基本是以元音音素开头，个别单词除外，如university的第一个字母u发音是ju:所以是辅音前面用a。 等以后掌握了音标就可以很清楚的知道单词是否以元音或辅音开头了。 不定冠词与 数词one 同源，是"一 (个)、每一（个）、任一 …

We use the indefinite article, a/an, with singular nouns when the listener/reader does not know exactly which one we are referring to: Police are searching for a 14-year-old girl. We also use it to show that the person or thing is one of a group: She is a pupil at London Road School.

2017年3月8日 · am是be动词,只能主语是i的时候用. an是冠词,修饰名词用的,当这个名词以元音开头时,即以a.e.i.o.u开头时.冠词用an.