| 单词 | a |
| 释义 | a a1 /euh/; when stressed /ay/, indefinite article. 1. not any particular or certain one of a class or group: a man; a chemical; a house. 2. a certain; a particular: one at a time; two of a kind; A Miss Johnson called. 3. another; one typically resembling: a Cicero in eloquence; a Jonah. 4. one (used before plural nouns that are preceded by a quantifier singular in form): a hundred men (compare hundreds of men); a dozen times (compare dozens of times). 5. indefinitely or nonspecifically (used with adjectives expressing number): a great many years; a few stars. 6. one (used before a noun expressing quantity): a yard of ribbon; a score of times. 7. any; a single: not a one. [ME; orig. preconsonantal phonetic var. of AN1] Usage. In both spoken and written English the choice of A1 or AN1 is determined by the initial sound of the word that follows. Before a consonant sound, A is used; before a vowel sound, AN: a book, a rose; an apple, an opera. Problems arise occasionally when the following word begins with a vowel letter but actually starts with a consonant sound, or vice versa. Some words beginning with the vowel letter u and all words beginning with the vowel letters eu are pronounced with a beginning consonant sound, as if the first letter were y: a union; a European. Some other spellings that begin with a vowel letter may also stand for an initial consonant sound: a ewe; a ewer. The words one and once and all compounds of which they are the first element begin with a w sound: a one-room apartment; a once-famous actor. The names of the consonant letters f, h, l, m, n, r, s, and x are pronounced with a beginning vowel sound. When these letters are used as words or to form words, they are preceded by AN: to rent an L-shaped studio; to fly an SST. The names of the vowel letter u and the semivowel letters w and y are pronounced with a beginning consonant sound. When used as words, they are preceded by A: a U-turn; The plumber installed a Y in the line. In some words beginning with the letter h, the h is not pronounced; the words actually begin with a vowel sound: an hour; an honor. When the h is strongly pronounced, as in a stressed syllable at the beginning of a word, it is preceded by A: a history of the Sioux; a hero sandwich. (In former times AN was used before strongly pronounced h in a stressed first syllable: an hundred.) Such adjectives as historic, historical, heroic, and habitual, which begin with an unstressed syllable and often with a silent or weakly pronounced h, are commonly preceded by AN, especially in British English. But the use of A rather than AN is widespread in both speech and writing: a historical novel; a habitual criminal. Hotel and unique are occasionally preceded by AN, but this use is increasingly old-fashioned. Although in some dialects AN has yielded to A in all cases, edited writing reflects usage as described above. a2 /euh/; when stressed /ay/, prep. each; every; per: ten cents a sheet; three times a day. [orig. ME a, preconsonantal var. of ON (see A-1); confused with A1] a3 /euh/, prep. Pron. Spelling. a reduced, unstressed form of of (often written as part of a single, unhyphenated word): cloth a gold; time a day; kinda; sorta. [ME; unstressed preconsonantal var. of OF1] a4 /euh/, auxiliary verb. Pron. Spelling. a reduced, unstressed form of auxiliary have following some modals, as might, should, could, would, and must (usually written as part of a single, unhyphenated word): We shoulda gone. Cf. of2. [ME; phonetic var. of HAVE] a5 /euh, a, ah/, pron. 1. Brit. Dial. 2. he. 3. she. 4. it. 5. they. 6. I. [ME a, ha] Meas. are; ares. Symbol, Logic. See universal affirmative. |
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