1 DET （在发音以元音开始的单词前，代替不定冠词a） An is used instead of 'a', the indefinite article, in front of words that begin with vowel sounds. （在发音以元音开始的单词前，代替不定冠词a）
| Usage | a and an with the letter h |
| Before a word beginning with h: a is used if the h is pronounced and the first syllable is stressed at all: Paul has a hidden agenda. That is a harmonica. I'm staying at a hotel. A or an is used if the h is pronounced by the speaker: This is a/an historic moment. He is making a/an habitual mistake. (If an is used, the h isn't pronounced.) An is used if the h is never pronounced: It is an honour to meet you. |
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